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Theorem supmul 9722
Description: The supremum function distributes over multiplication, in the sense that  ( sup A
)  x.  ( sup B )  =  sup ( A  x.  B
), where  A  x.  B is shorthand for  { a  x.  b  |  a  e.  A ,  b  e.  B } and is defined as  C below. We made use of this in our definition of multiplication in the Dedekind cut construction of the reals (see df-mp 8608). (Contributed by Mario Carneiro, 5-Jul-2013.) (Revised by Mario Carneiro, 6-Sep-2014.)
Hypotheses
Ref Expression
supmul.1  |-  C  =  { z  |  E. v  e.  A  E. b  e.  B  z  =  ( v  x.  b ) }
supmul.2  |-  ( ph  <->  ( ( A. x  e.  A  0  <_  x  /\  A. x  e.  B 
0  <_  x )  /\  ( A  C_  RR  /\  A  =/=  (/)  /\  E. x  e.  RR  A. y  e.  A  y  <_  x )  /\  ( B 
C_  RR  /\  B  =/=  (/)  /\  E. x  e.  RR  A. y  e.  B  y  <_  x
) ) )
Assertion
Ref Expression
supmul  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  =  sup ( C ,  RR ,  <  ) )
Distinct variable groups:    A, b,
v, x, y, z    B, b, v, x, y, z    x, C    ph, b,
z
Allowed substitution hints:    ph( x, y, v)    C( y, z, v, b)

Proof of Theorem supmul
Dummy variables  a  w are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 supmul.2 . . . . . . 7  |-  ( ph  <->  ( ( A. x  e.  A  0  <_  x  /\  A. x  e.  B 
0  <_  x )  /\  ( A  C_  RR  /\  A  =/=  (/)  /\  E. x  e.  RR  A. y  e.  A  y  <_  x )  /\  ( B 
C_  RR  /\  B  =/=  (/)  /\  E. x  e.  RR  A. y  e.  B  y  <_  x
) ) )
21simp2bi 971 . . . . . 6  |-  ( ph  ->  ( A  C_  RR  /\  A  =/=  (/)  /\  E. x  e.  RR  A. y  e.  A  y  <_  x ) )
3 suprcl 9714 . . . . . 6  |-  ( ( A  C_  RR  /\  A  =/=  (/)  /\  E. x  e.  RR  A. y  e.  A  y  <_  x
)  ->  sup ( A ,  RR ,  <  )  e.  RR )
42, 3syl 15 . . . . 5  |-  ( ph  ->  sup ( A ,  RR ,  <  )  e.  RR )
51simp3bi 972 . . . . . 6  |-  ( ph  ->  ( B  C_  RR  /\  B  =/=  (/)  /\  E. x  e.  RR  A. y  e.  B  y  <_  x ) )
6 suprcl 9714 . . . . . 6  |-  ( ( B  C_  RR  /\  B  =/=  (/)  /\  E. x  e.  RR  A. y  e.  B  y  <_  x
)  ->  sup ( B ,  RR ,  <  )  e.  RR )
75, 6syl 15 . . . . 5  |-  ( ph  ->  sup ( B ,  RR ,  <  )  e.  RR )
8 recn 8827 . . . . . 6  |-  ( sup ( A ,  RR ,  <  )  e.  RR  ->  sup ( A ,  RR ,  <  )  e.  CC )
9 recn 8827 . . . . . 6  |-  ( sup ( B ,  RR ,  <  )  e.  RR  ->  sup ( B ,  RR ,  <  )  e.  CC )
10 mulcom 8823 . . . . . 6  |-  ( ( sup ( A ,  RR ,  <  )  e.  CC  /\  sup ( B ,  RR ,  <  )  e.  CC )  ->  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  =  ( sup ( B ,  RR ,  <  )  x. 
sup ( A ,  RR ,  <  ) ) )
118, 9, 10syl2an 463 . . . . 5  |-  ( ( sup ( A ,  RR ,  <  )  e.  RR  /\  sup ( B ,  RR ,  <  )  e.  RR )  ->  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  =  ( sup ( B ,  RR ,  <  )  x. 
sup ( A ,  RR ,  <  ) ) )
124, 7, 11syl2anc 642 . . . 4  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  =  ( sup ( B ,  RR ,  <  )  x.  sup ( A ,  RR ,  <  ) ) )
135simp2d 968 . . . . . . 7  |-  ( ph  ->  B  =/=  (/) )
14 n0 3464 . . . . . . 7  |-  ( B  =/=  (/)  <->  E. b  b  e.  B )
1513, 14sylib 188 . . . . . 6  |-  ( ph  ->  E. b  b  e.  B )
16 0re 8838 . . . . . . . . . 10  |-  0  e.  RR
1716a1i 10 . . . . . . . . 9  |-  ( (
ph  /\  b  e.  B )  ->  0  e.  RR )
185simp1d 967 . . . . . . . . . 10  |-  ( ph  ->  B  C_  RR )
1918sselda 3180 . . . . . . . . 9  |-  ( (
ph  /\  b  e.  B )  ->  b  e.  RR )
207adantr 451 . . . . . . . . 9  |-  ( (
ph  /\  b  e.  B )  ->  sup ( B ,  RR ,  <  )  e.  RR )
21 simp1r 980 . . . . . . . . . . . 12  |-  ( ( ( A. x  e.  A  0  <_  x  /\  A. x  e.  B 
0  <_  x )  /\  ( A  C_  RR  /\  A  =/=  (/)  /\  E. x  e.  RR  A. y  e.  A  y  <_  x )  /\  ( B 
C_  RR  /\  B  =/=  (/)  /\  E. x  e.  RR  A. y  e.  B  y  <_  x
) )  ->  A. x  e.  B  0  <_  x )
221, 21sylbi 187 . . . . . . . . . . 11  |-  ( ph  ->  A. x  e.  B 
0  <_  x )
23 breq2 4027 . . . . . . . . . . . 12  |-  ( x  =  b  ->  (
0  <_  x  <->  0  <_  b ) )
2423rspccv 2881 . . . . . . . . . . 11  |-  ( A. x  e.  B  0  <_  x  ->  ( b  e.  B  ->  0  <_ 
b ) )
2522, 24syl 15 . . . . . . . . . 10  |-  ( ph  ->  ( b  e.  B  ->  0  <_  b )
)
2625imp 418 . . . . . . . . 9  |-  ( (
ph  /\  b  e.  B )  ->  0  <_  b )
27 suprub 9715 . . . . . . . . . 10  |-  ( ( ( B  C_  RR  /\  B  =/=  (/)  /\  E. x  e.  RR  A. y  e.  B  y  <_  x )  /\  b  e.  B )  ->  b  <_  sup ( B ,  RR ,  <  ) )
285, 27sylan 457 . . . . . . . . 9  |-  ( (
ph  /\  b  e.  B )  ->  b  <_  sup ( B ,  RR ,  <  ) )
2917, 19, 20, 26, 28letrd 8973 . . . . . . . 8  |-  ( (
ph  /\  b  e.  B )  ->  0  <_  sup ( B ,  RR ,  <  ) )
3029ex 423 . . . . . . 7  |-  ( ph  ->  ( b  e.  B  ->  0  <_  sup ( B ,  RR ,  <  ) ) )
3130exlimdv 1664 . . . . . 6  |-  ( ph  ->  ( E. b  b  e.  B  ->  0  <_  sup ( B ,  RR ,  <  ) ) )
3215, 31mpd 14 . . . . 5  |-  ( ph  ->  0  <_  sup ( B ,  RR ,  <  ) )
33 simp1l 979 . . . . . 6  |-  ( ( ( A. x  e.  A  0  <_  x  /\  A. x  e.  B 
0  <_  x )  /\  ( A  C_  RR  /\  A  =/=  (/)  /\  E. x  e.  RR  A. y  e.  A  y  <_  x )  /\  ( B 
C_  RR  /\  B  =/=  (/)  /\  E. x  e.  RR  A. y  e.  B  y  <_  x
) )  ->  A. x  e.  A  0  <_  x )
341, 33sylbi 187 . . . . 5  |-  ( ph  ->  A. x  e.  A 
0  <_  x )
35 eqid 2283 . . . . . 6  |-  { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) }  =  { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) }
36 biid 227 . . . . . 6  |-  ( ( ( sup ( B ,  RR ,  <  )  e.  RR  /\  0  <_  sup ( B ,  RR ,  <  )  /\  A. x  e.  A  0  <_  x )  /\  ( A  C_  RR  /\  A  =/=  (/)  /\  E. x  e.  RR  A. y  e.  A  y  <_  x
) )  <->  ( ( sup ( B ,  RR ,  <  )  e.  RR  /\  0  <_  sup ( B ,  RR ,  <  )  /\  A. x  e.  A  0  <_  x )  /\  ( A 
C_  RR  /\  A  =/=  (/)  /\  E. x  e.  RR  A. y  e.  A  y  <_  x
) ) )
3735, 36supmul1 9719 . . . . 5  |-  ( ( ( sup ( B ,  RR ,  <  )  e.  RR  /\  0  <_  sup ( B ,  RR ,  <  )  /\  A. x  e.  A  0  <_  x )  /\  ( A  C_  RR  /\  A  =/=  (/)  /\  E. x  e.  RR  A. y  e.  A  y  <_  x
) )  ->  ( sup ( B ,  RR ,  <  )  x.  sup ( A ,  RR ,  <  ) )  =  sup ( { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } ,  RR ,  <  ) )
387, 32, 34, 2, 37syl31anc 1185 . . . 4  |-  ( ph  ->  ( sup ( B ,  RR ,  <  )  x.  sup ( A ,  RR ,  <  ) )  =  sup ( { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } ,  RR ,  <  ) )
3912, 38eqtrd 2315 . . 3  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  =  sup ( { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } ,  RR ,  <  ) )
40 vex 2791 . . . . . . 7  |-  w  e. 
_V
41 eqeq1 2289 . . . . . . . 8  |-  ( z  =  w  ->  (
z  =  ( sup ( B ,  RR ,  <  )  x.  a
)  <->  w  =  ( sup ( B ,  RR ,  <  )  x.  a
) ) )
4241rexbidv 2564 . . . . . . 7  |-  ( z  =  w  ->  ( E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a )  <->  E. a  e.  A  w  =  ( sup ( B ,  RR ,  <  )  x.  a ) ) )
4340, 42elab 2914 . . . . . 6  |-  ( w  e.  { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) }  <->  E. a  e.  A  w  =  ( sup ( B ,  RR ,  <  )  x.  a ) )
447adantr 451 . . . . . . . . . 10  |-  ( (
ph  /\  a  e.  A )  ->  sup ( B ,  RR ,  <  )  e.  RR )
452simp1d 967 . . . . . . . . . . 11  |-  ( ph  ->  A  C_  RR )
4645sselda 3180 . . . . . . . . . 10  |-  ( (
ph  /\  a  e.  A )  ->  a  e.  RR )
47 recn 8827 . . . . . . . . . . 11  |-  ( a  e.  RR  ->  a  e.  CC )
48 mulcom 8823 . . . . . . . . . . 11  |-  ( ( sup ( B ,  RR ,  <  )  e.  CC  /\  a  e.  CC )  ->  ( sup ( B ,  RR ,  <  )  x.  a
)  =  ( a  x.  sup ( B ,  RR ,  <  ) ) )
499, 47, 48syl2an 463 . . . . . . . . . 10  |-  ( ( sup ( B ,  RR ,  <  )  e.  RR  /\  a  e.  RR )  ->  ( sup ( B ,  RR ,  <  )  x.  a
)  =  ( a  x.  sup ( B ,  RR ,  <  ) ) )
5044, 46, 49syl2anc 642 . . . . . . . . 9  |-  ( (
ph  /\  a  e.  A )  ->  ( sup ( B ,  RR ,  <  )  x.  a
)  =  ( a  x.  sup ( B ,  RR ,  <  ) ) )
51 breq2 4027 . . . . . . . . . . . . . 14  |-  ( x  =  a  ->  (
0  <_  x  <->  0  <_  a ) )
5251rspccv 2881 . . . . . . . . . . . . 13  |-  ( A. x  e.  A  0  <_  x  ->  ( a  e.  A  ->  0  <_ 
a ) )
5334, 52syl 15 . . . . . . . . . . . 12  |-  ( ph  ->  ( a  e.  A  ->  0  <_  a )
)
5453imp 418 . . . . . . . . . . 11  |-  ( (
ph  /\  a  e.  A )  ->  0  <_  a )
5522adantr 451 . . . . . . . . . . 11  |-  ( (
ph  /\  a  e.  A )  ->  A. x  e.  B  0  <_  x )
565adantr 451 . . . . . . . . . . 11  |-  ( (
ph  /\  a  e.  A )  ->  ( B  C_  RR  /\  B  =/=  (/)  /\  E. x  e.  RR  A. y  e.  B  y  <_  x
) )
57 eqid 2283 . . . . . . . . . . . 12  |-  { z  |  E. b  e.  B  z  =  ( a  x.  b ) }  =  { z  |  E. b  e.  B  z  =  ( a  x.  b ) }
58 biid 227 . . . . . . . . . . . 12  |-  ( ( ( a  e.  RR  /\  0  <_  a  /\  A. x  e.  B  0  <_  x )  /\  ( B  C_  RR  /\  B  =/=  (/)  /\  E. x  e.  RR  A. y  e.  B  y  <_  x
) )  <->  ( (
a  e.  RR  /\  0  <_  a  /\  A. x  e.  B  0  <_  x )  /\  ( B  C_  RR  /\  B  =/=  (/)  /\  E. x  e.  RR  A. y  e.  B  y  <_  x
) ) )
5957, 58supmul1 9719 . . . . . . . . . . 11  |-  ( ( ( a  e.  RR  /\  0  <_  a  /\  A. x  e.  B  0  <_  x )  /\  ( B  C_  RR  /\  B  =/=  (/)  /\  E. x  e.  RR  A. y  e.  B  y  <_  x
) )  ->  (
a  x.  sup ( B ,  RR ,  <  ) )  =  sup ( { z  |  E. b  e.  B  z  =  ( a  x.  b ) } ,  RR ,  <  ) )
6046, 54, 55, 56, 59syl31anc 1185 . . . . . . . . . 10  |-  ( (
ph  /\  a  e.  A )  ->  (
a  x.  sup ( B ,  RR ,  <  ) )  =  sup ( { z  |  E. b  e.  B  z  =  ( a  x.  b ) } ,  RR ,  <  ) )
61 eqeq1 2289 . . . . . . . . . . . . . . 15  |-  ( z  =  w  ->  (
z  =  ( a  x.  b )  <->  w  =  ( a  x.  b
) ) )
6261rexbidv 2564 . . . . . . . . . . . . . 14  |-  ( z  =  w  ->  ( E. b  e.  B  z  =  ( a  x.  b )  <->  E. b  e.  B  w  =  ( a  x.  b
) ) )
6340, 62elab 2914 . . . . . . . . . . . . 13  |-  ( w  e.  { z  |  E. b  e.  B  z  =  ( a  x.  b ) }  <->  E. b  e.  B  w  =  ( a  x.  b
) )
64 rspe 2604 . . . . . . . . . . . . . . . 16  |-  ( ( a  e.  A  /\  E. b  e.  B  w  =  ( a  x.  b ) )  ->  E. a  e.  A  E. b  e.  B  w  =  ( a  x.  b ) )
65 oveq1 5865 . . . . . . . . . . . . . . . . . . . . 21  |-  ( v  =  a  ->  (
v  x.  b )  =  ( a  x.  b ) )
6665eqeq2d 2294 . . . . . . . . . . . . . . . . . . . 20  |-  ( v  =  a  ->  (
z  =  ( v  x.  b )  <->  z  =  ( a  x.  b
) ) )
6766rexbidv 2564 . . . . . . . . . . . . . . . . . . 19  |-  ( v  =  a  ->  ( E. b  e.  B  z  =  ( v  x.  b )  <->  E. b  e.  B  z  =  ( a  x.  b
) ) )
6867cbvrexv 2765 . . . . . . . . . . . . . . . . . 18  |-  ( E. v  e.  A  E. b  e.  B  z  =  ( v  x.  b )  <->  E. a  e.  A  E. b  e.  B  z  =  ( a  x.  b
) )
69612rexbidv 2586 . . . . . . . . . . . . . . . . . 18  |-  ( z  =  w  ->  ( E. a  e.  A  E. b  e.  B  z  =  ( a  x.  b )  <->  E. a  e.  A  E. b  e.  B  w  =  ( a  x.  b
) ) )
7068, 69syl5bb 248 . . . . . . . . . . . . . . . . 17  |-  ( z  =  w  ->  ( E. v  e.  A  E. b  e.  B  z  =  ( v  x.  b )  <->  E. a  e.  A  E. b  e.  B  w  =  ( a  x.  b
) ) )
71 supmul.1 . . . . . . . . . . . . . . . . 17  |-  C  =  { z  |  E. v  e.  A  E. b  e.  B  z  =  ( v  x.  b ) }
7240, 70, 71elab2 2917 . . . . . . . . . . . . . . . 16  |-  ( w  e.  C  <->  E. a  e.  A  E. b  e.  B  w  =  ( a  x.  b
) )
7364, 72sylibr 203 . . . . . . . . . . . . . . 15  |-  ( ( a  e.  A  /\  E. b  e.  B  w  =  ( a  x.  b ) )  ->  w  e.  C )
7473ex 423 . . . . . . . . . . . . . 14  |-  ( a  e.  A  ->  ( E. b  e.  B  w  =  ( a  x.  b )  ->  w  e.  C ) )
7571, 1supmullem2 9721 . . . . . . . . . . . . . . 15  |-  ( ph  ->  ( C  C_  RR  /\  C  =/=  (/)  /\  E. x  e.  RR  A. w  e.  C  w  <_  x ) )
76 suprub 9715 . . . . . . . . . . . . . . . 16  |-  ( ( ( C  C_  RR  /\  C  =/=  (/)  /\  E. x  e.  RR  A. w  e.  C  w  <_  x )  /\  w  e.  C )  ->  w  <_  sup ( C ,  RR ,  <  ) )
7776ex 423 . . . . . . . . . . . . . . 15  |-  ( ( C  C_  RR  /\  C  =/=  (/)  /\  E. x  e.  RR  A. w  e.  C  w  <_  x
)  ->  ( w  e.  C  ->  w  <_  sup ( C ,  RR ,  <  ) ) )
7875, 77syl 15 . . . . . . . . . . . . . 14  |-  ( ph  ->  ( w  e.  C  ->  w  <_  sup ( C ,  RR ,  <  ) ) )
7974, 78sylan9r 639 . . . . . . . . . . . . 13  |-  ( (
ph  /\  a  e.  A )  ->  ( E. b  e.  B  w  =  ( a  x.  b )  ->  w  <_  sup ( C ,  RR ,  <  ) ) )
8063, 79syl5bi 208 . . . . . . . . . . . 12  |-  ( (
ph  /\  a  e.  A )  ->  (
w  e.  { z  |  E. b  e.  B  z  =  ( a  x.  b ) }  ->  w  <_  sup ( C ,  RR ,  <  ) ) )
8180ralrimiv 2625 . . . . . . . . . . 11  |-  ( (
ph  /\  a  e.  A )  ->  A. w  e.  { z  |  E. b  e.  B  z  =  ( a  x.  b ) } w  <_  sup ( C ,  RR ,  <  ) )
8246adantr 451 . . . . . . . . . . . . . . . 16  |-  ( ( ( ph  /\  a  e.  A )  /\  b  e.  B )  ->  a  e.  RR )
8319adantlr 695 . . . . . . . . . . . . . . . 16  |-  ( ( ( ph  /\  a  e.  A )  /\  b  e.  B )  ->  b  e.  RR )
8482, 83remulcld 8863 . . . . . . . . . . . . . . 15  |-  ( ( ( ph  /\  a  e.  A )  /\  b  e.  B )  ->  (
a  x.  b )  e.  RR )
85 eleq1a 2352 . . . . . . . . . . . . . . 15  |-  ( ( a  x.  b )  e.  RR  ->  (
z  =  ( a  x.  b )  -> 
z  e.  RR ) )
8684, 85syl 15 . . . . . . . . . . . . . 14  |-  ( ( ( ph  /\  a  e.  A )  /\  b  e.  B )  ->  (
z  =  ( a  x.  b )  -> 
z  e.  RR ) )
8786rexlimdva 2667 . . . . . . . . . . . . 13  |-  ( (
ph  /\  a  e.  A )  ->  ( E. b  e.  B  z  =  ( a  x.  b )  ->  z  e.  RR ) )
8887abssdv 3247 . . . . . . . . . . . 12  |-  ( (
ph  /\  a  e.  A )  ->  { z  |  E. b  e.  B  z  =  ( a  x.  b ) }  C_  RR )
89 ovex 5883 . . . . . . . . . . . . . . . . . . 19  |-  ( a  x.  b )  e. 
_V
9089isseti 2794 . . . . . . . . . . . . . . . . . 18  |-  E. w  w  =  ( a  x.  b )
9190rgenw 2610 . . . . . . . . . . . . . . . . 17  |-  A. b  e.  B  E. w  w  =  ( a  x.  b )
92 r19.2z 3543 . . . . . . . . . . . . . . . . 17  |-  ( ( B  =/=  (/)  /\  A. b  e.  B  E. w  w  =  (
a  x.  b ) )  ->  E. b  e.  B  E. w  w  =  ( a  x.  b ) )
9313, 91, 92sylancl 643 . . . . . . . . . . . . . . . 16  |-  ( ph  ->  E. b  e.  B  E. w  w  =  ( a  x.  b
) )
94 rexcom4 2807 . . . . . . . . . . . . . . . 16  |-  ( E. b  e.  B  E. w  w  =  (
a  x.  b )  <->  E. w E. b  e.  B  w  =  ( a  x.  b ) )
9593, 94sylib 188 . . . . . . . . . . . . . . 15  |-  ( ph  ->  E. w E. b  e.  B  w  =  ( a  x.  b
) )
9662cbvexv 1943 . . . . . . . . . . . . . . 15  |-  ( E. z E. b  e.  B  z  =  ( a  x.  b )  <->  E. w E. b  e.  B  w  =  ( a  x.  b ) )
9795, 96sylibr 203 . . . . . . . . . . . . . 14  |-  ( ph  ->  E. z E. b  e.  B  z  =  ( a  x.  b
) )
98 abn0 3473 . . . . . . . . . . . . . 14  |-  ( { z  |  E. b  e.  B  z  =  ( a  x.  b
) }  =/=  (/)  <->  E. z E. b  e.  B  z  =  ( a  x.  b ) )
9997, 98sylibr 203 . . . . . . . . . . . . 13  |-  ( ph  ->  { z  |  E. b  e.  B  z  =  ( a  x.  b ) }  =/=  (/) )
10099adantr 451 . . . . . . . . . . . 12  |-  ( (
ph  /\  a  e.  A )  ->  { z  |  E. b  e.  B  z  =  ( a  x.  b ) }  =/=  (/) )
101 suprcl 9714 . . . . . . . . . . . . . . 15  |-  ( ( C  C_  RR  /\  C  =/=  (/)  /\  E. x  e.  RR  A. w  e.  C  w  <_  x
)  ->  sup ( C ,  RR ,  <  )  e.  RR )
10275, 101syl 15 . . . . . . . . . . . . . 14  |-  ( ph  ->  sup ( C ,  RR ,  <  )  e.  RR )
103102adantr 451 . . . . . . . . . . . . 13  |-  ( (
ph  /\  a  e.  A )  ->  sup ( C ,  RR ,  <  )  e.  RR )
104 breq2 4027 . . . . . . . . . . . . . . 15  |-  ( x  =  sup ( C ,  RR ,  <  )  ->  ( w  <_  x 
<->  w  <_  sup ( C ,  RR ,  <  ) ) )
105104ralbidv 2563 . . . . . . . . . . . . . 14  |-  ( x  =  sup ( C ,  RR ,  <  )  ->  ( A. w  e.  { z  |  E. b  e.  B  z  =  ( a  x.  b ) } w  <_  x  <->  A. w  e.  {
z  |  E. b  e.  B  z  =  ( a  x.  b
) } w  <_  sup ( C ,  RR ,  <  ) ) )
106105rspcev 2884 . . . . . . . . . . . . 13  |-  ( ( sup ( C ,  RR ,  <  )  e.  RR  /\  A. w  e.  { z  |  E. b  e.  B  z  =  ( a  x.  b ) } w  <_  sup ( C ,  RR ,  <  ) )  ->  E. x  e.  RR  A. w  e.  { z  |  E. b  e.  B  z  =  ( a  x.  b ) } w  <_  x
)
107103, 81, 106syl2anc 642 . . . . . . . . . . . 12  |-  ( (
ph  /\  a  e.  A )  ->  E. x  e.  RR  A. w  e. 
{ z  |  E. b  e.  B  z  =  ( a  x.  b ) } w  <_  x )
108 suprleub 9718 . . . . . . . . . . . 12  |-  ( ( ( { z  |  E. b  e.  B  z  =  ( a  x.  b ) }  C_  RR  /\  { z  |  E. b  e.  B  z  =  ( a  x.  b ) }  =/=  (/) 
/\  E. x  e.  RR  A. w  e.  { z  |  E. b  e.  B  z  =  ( a  x.  b ) } w  <_  x
)  /\  sup ( C ,  RR ,  <  )  e.  RR )  ->  ( sup ( { z  |  E. b  e.  B  z  =  ( a  x.  b ) } ,  RR ,  <  )  <_  sup ( C ,  RR ,  <  )  <->  A. w  e.  { z  |  E. b  e.  B  z  =  ( a  x.  b ) } w  <_  sup ( C ,  RR ,  <  ) ) )
10988, 100, 107, 103, 108syl31anc 1185 . . . . . . . . . . 11  |-  ( (
ph  /\  a  e.  A )  ->  ( sup ( { z  |  E. b  e.  B  z  =  ( a  x.  b ) } ,  RR ,  <  )  <_  sup ( C ,  RR ,  <  )  <->  A. w  e.  { z  |  E. b  e.  B  z  =  ( a  x.  b ) } w  <_  sup ( C ,  RR ,  <  ) ) )
11081, 109mpbird 223 . . . . . . . . . 10  |-  ( (
ph  /\  a  e.  A )  ->  sup ( { z  |  E. b  e.  B  z  =  ( a  x.  b ) } ,  RR ,  <  )  <_  sup ( C ,  RR ,  <  ) )
11160, 110eqbrtrd 4043 . . . . . . . . 9  |-  ( (
ph  /\  a  e.  A )  ->  (
a  x.  sup ( B ,  RR ,  <  ) )  <_  sup ( C ,  RR ,  <  ) )
11250, 111eqbrtrd 4043 . . . . . . . 8  |-  ( (
ph  /\  a  e.  A )  ->  ( sup ( B ,  RR ,  <  )  x.  a
)  <_  sup ( C ,  RR ,  <  ) )
113 breq1 4026 . . . . . . . 8  |-  ( w  =  ( sup ( B ,  RR ,  <  )  x.  a )  ->  ( w  <_  sup ( C ,  RR ,  <  )  <->  ( sup ( B ,  RR ,  <  )  x.  a )  <_  sup ( C ,  RR ,  <  ) ) )
114112, 113syl5ibrcom 213 . . . . . . 7  |-  ( (
ph  /\  a  e.  A )  ->  (
w  =  ( sup ( B ,  RR ,  <  )  x.  a
)  ->  w  <_  sup ( C ,  RR ,  <  ) ) )
115114rexlimdva 2667 . . . . . 6  |-  ( ph  ->  ( E. a  e.  A  w  =  ( sup ( B ,  RR ,  <  )  x.  a )  ->  w  <_  sup ( C ,  RR ,  <  ) ) )
11643, 115syl5bi 208 . . . . 5  |-  ( ph  ->  ( w  e.  {
z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) }  ->  w  <_  sup ( C ,  RR ,  <  ) ) )
117116ralrimiv 2625 . . . 4  |-  ( ph  ->  A. w  e.  {
z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } w  <_  sup ( C ,  RR ,  <  ) )
11844, 46remulcld 8863 . . . . . . . 8  |-  ( (
ph  /\  a  e.  A )  ->  ( sup ( B ,  RR ,  <  )  x.  a
)  e.  RR )
119 eleq1a 2352 . . . . . . . 8  |-  ( ( sup ( B ,  RR ,  <  )  x.  a )  e.  RR  ->  ( z  =  ( sup ( B ,  RR ,  <  )  x.  a )  ->  z  e.  RR ) )
120118, 119syl 15 . . . . . . 7  |-  ( (
ph  /\  a  e.  A )  ->  (
z  =  ( sup ( B ,  RR ,  <  )  x.  a
)  ->  z  e.  RR ) )
121120rexlimdva 2667 . . . . . 6  |-  ( ph  ->  ( E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a )  ->  z  e.  RR ) )
122121abssdv 3247 . . . . 5  |-  ( ph  ->  { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) }  C_  RR )
1232simp2d 968 . . . . . . . 8  |-  ( ph  ->  A  =/=  (/) )
124 ovex 5883 . . . . . . . . . 10  |-  ( sup ( B ,  RR ,  <  )  x.  a
)  e.  _V
125124isseti 2794 . . . . . . . . 9  |-  E. z 
z  =  ( sup ( B ,  RR ,  <  )  x.  a
)
126125rgenw 2610 . . . . . . . 8  |-  A. a  e.  A  E. z 
z  =  ( sup ( B ,  RR ,  <  )  x.  a
)
127 r19.2z 3543 . . . . . . . 8  |-  ( ( A  =/=  (/)  /\  A. a  e.  A  E. z  z  =  ( sup ( B ,  RR ,  <  )  x.  a
) )  ->  E. a  e.  A  E. z 
z  =  ( sup ( B ,  RR ,  <  )  x.  a
) )
128123, 126, 127sylancl 643 . . . . . . 7  |-  ( ph  ->  E. a  e.  A  E. z  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) )
129 rexcom4 2807 . . . . . . 7  |-  ( E. a  e.  A  E. z  z  =  ( sup ( B ,  RR ,  <  )  x.  a
)  <->  E. z E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) )
130128, 129sylib 188 . . . . . 6  |-  ( ph  ->  E. z E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) )
131 abn0 3473 . . . . . 6  |-  ( { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) }  =/=  (/)  <->  E. z E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) )
132130, 131sylibr 203 . . . . 5  |-  ( ph  ->  { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) }  =/=  (/) )
133104ralbidv 2563 . . . . . . 7  |-  ( x  =  sup ( C ,  RR ,  <  )  ->  ( A. w  e.  { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } w  <_  x  <->  A. w  e.  { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } w  <_  sup ( C ,  RR ,  <  ) ) )
134133rspcev 2884 . . . . . 6  |-  ( ( sup ( C ,  RR ,  <  )  e.  RR  /\  A. w  e.  { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } w  <_  sup ( C ,  RR ,  <  ) )  ->  E. x  e.  RR  A. w  e. 
{ z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } w  <_  x
)
135102, 117, 134syl2anc 642 . . . . 5  |-  ( ph  ->  E. x  e.  RR  A. w  e.  { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } w  <_  x )
136 suprleub 9718 . . . . 5  |-  ( ( ( { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) }  C_  RR  /\  {
z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) }  =/=  (/) 
/\  E. x  e.  RR  A. w  e.  { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } w  <_  x )  /\  sup ( C ,  RR ,  <  )  e.  RR )  ->  ( sup ( { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } ,  RR ,  <  )  <_  sup ( C ,  RR ,  <  )  <->  A. w  e.  {
z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } w  <_  sup ( C ,  RR ,  <  ) ) )
137122, 132, 135, 102, 136syl31anc 1185 . . . 4  |-  ( ph  ->  ( sup ( { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } ,  RR ,  <  )  <_  sup ( C ,  RR ,  <  )  <->  A. w  e.  { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } w  <_  sup ( C ,  RR ,  <  ) ) )
138117, 137mpbird 223 . . 3  |-  ( ph  ->  sup ( { z  |  E. a  e.  A  z  =  ( sup ( B ,  RR ,  <  )  x.  a ) } ,  RR ,  <  )  <_  sup ( C ,  RR ,  <  ) )
13939, 138eqbrtrd 4043 . 2  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  <_  sup ( C ,  RR ,  <  ) )
14071, 1supmullem1 9720 . . 3  |-  ( ph  ->  A. w  e.  C  w  <_  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) ) )
1414, 7remulcld 8863 . . . 4  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  e.  RR )
142 suprleub 9718 . . . 4  |-  ( ( ( C  C_  RR  /\  C  =/=  (/)  /\  E. x  e.  RR  A. w  e.  C  w  <_  x )  /\  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  e.  RR )  ->  ( sup ( C ,  RR ,  <  )  <_  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  <->  A. w  e.  C  w  <_  ( sup ( A ,  RR ,  <  )  x. 
sup ( B ,  RR ,  <  ) ) ) )
14375, 141, 142syl2anc 642 . . 3  |-  ( ph  ->  ( sup ( C ,  RR ,  <  )  <_  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  <->  A. w  e.  C  w  <_  ( sup ( A ,  RR ,  <  )  x. 
sup ( B ,  RR ,  <  ) ) ) )
144140, 143mpbird 223 . 2  |-  ( ph  ->  sup ( C ,  RR ,  <  )  <_ 
( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) ) )
145141, 102letri3d 8961 . 2  |-  ( ph  ->  ( ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  =  sup ( C ,  RR ,  <  )  <->  ( ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  <_  sup ( C ,  RR ,  <  )  /\  sup ( C ,  RR ,  <  )  <_  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) ) ) ) )
146139, 144, 145mpbir2and 888 1  |-  ( ph  ->  ( sup ( A ,  RR ,  <  )  x.  sup ( B ,  RR ,  <  ) )  =  sup ( C ,  RR ,  <  ) )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    /\ wa 358    /\ w3a 934   E.wex 1528    = wceq 1623    e. wcel 1684   {cab 2269    =/= wne 2446   A.wral 2543   E.wrex 2544    C_ wss 3152   (/)c0 3455   class class class wbr 4023  (class class class)co 5858   supcsup 7193   CCcc 8735   RRcr 8736   0cc0 8737    x. cmul 8742    < clt 8867    <_ cle 8868
This theorem is referenced by:  sqrlem5  11732
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1533  ax-5 1544  ax-17 1603  ax-9 1635  ax-8 1643  ax-13 1686  ax-14 1688  ax-6 1703  ax-7 1708  ax-11 1715  ax-12 1866  ax-ext 2264  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512  ax-resscn 8794  ax-1cn 8795  ax-icn 8796  ax-addcl 8797  ax-addrcl 8798  ax-mulcl 8799  ax-mulrcl 8800  ax-mulcom 8801  ax-addass 8802  ax-mulass 8803  ax-distr 8804  ax-i2m1 8805  ax-1ne0 8806  ax-1rid 8807  ax-rnegex 8808  ax-rrecex 8809  ax-cnre 8810  ax-pre-lttri 8811  ax-pre-lttrn 8812  ax-pre-ltadd 8813  ax-pre-mulgt0 8814  ax-pre-sup 8815
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-tru 1310  df-ex 1529  df-nf 1532  df-sb 1630  df-eu 2147  df-mo 2148  df-clab 2270  df-cleq 2276  df-clel 2279  df-nfc 2408  df-ne 2448  df-nel 2449  df-ral 2548  df-rex 2549  df-reu 2550  df-rmo 2551  df-rab 2552  df-v 2790  df-sbc 2992  df-csb 3082  df-dif 3155  df-un 3157  df-in 3159  df-ss 3166  df-nul 3456  df-if 3566  df-pw 3627  df-sn 3646  df-pr 3647  df-op 3649  df-uni 3828  df-br 4024  df-opab 4078  df-mpt 4079  df-id 4309  df-po 4314  df-so 4315  df-xp 4695  df-rel 4696  df-cnv 4697  df-co 4698  df-dm 4699  df-rn 4700  df-res 4701  df-ima 4702  df-iota 5219  df-fun 5257  df-fn 5258  df-f 5259  df-f1 5260  df-fo 5261  df-f1o 5262  df-fv 5263  df-ov 5861  df-oprab 5862  df-mpt2 5863  df-riota 6304  df-er 6660  df-en 6864  df-dom 6865  df-sdom 6866  df-sup 7194  df-pnf 8869  df-mnf 8870  df-xr 8871  df-ltxr 8872  df-le 8873  df-sub 9039  df-neg 9040  df-div 9424
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