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Theorem txindislem 17343
Description: Lemma for txindis 17344. (Contributed by Mario Carneiro, 14-Aug-2015.)
Assertion
Ref Expression
txindislem  |-  ( (  _I  `  A )  X.  (  _I  `  B ) )  =  (  _I  `  ( A  X.  B ) )

Proof of Theorem txindislem
StepHypRef Expression
1 xp0r 4784 . . 3  |-  ( (/)  X.  (  _I  `  B
) )  =  (/)
2 fvprc 5535 . . . 4  |-  ( -.  A  e.  _V  ->  (  _I  `  A )  =  (/) )
32xpeq1d 4728 . . 3  |-  ( -.  A  e.  _V  ->  ( (  _I  `  A
)  X.  (  _I 
`  B ) )  =  ( (/)  X.  (  _I  `  B ) ) )
4 simpr 447 . . . . . . . 8  |-  ( ( -.  A  e.  _V  /\  B  =  (/) )  ->  B  =  (/) )
54xpeq2d 4729 . . . . . . 7  |-  ( ( -.  A  e.  _V  /\  B  =  (/) )  -> 
( A  X.  B
)  =  ( A  X.  (/) ) )
6 xp0 5114 . . . . . . 7  |-  ( A  X.  (/) )  =  (/)
75, 6syl6eq 2344 . . . . . 6  |-  ( ( -.  A  e.  _V  /\  B  =  (/) )  -> 
( A  X.  B
)  =  (/) )
87fveq2d 5545 . . . . 5  |-  ( ( -.  A  e.  _V  /\  B  =  (/) )  -> 
(  _I  `  ( A  X.  B ) )  =  (  _I  `  (/) ) )
9 0ex 4166 . . . . . 6  |-  (/)  e.  _V
10 fvi 5595 . . . . . 6  |-  ( (/)  e.  _V  ->  (  _I  `  (/) )  =  (/) )
119, 10ax-mp 8 . . . . 5  |-  (  _I 
`  (/) )  =  (/)
128, 11syl6eq 2344 . . . 4  |-  ( ( -.  A  e.  _V  /\  B  =  (/) )  -> 
(  _I  `  ( A  X.  B ) )  =  (/) )
13 dmexg 4955 . . . . . . . 8  |-  ( ( A  X.  B )  e.  _V  ->  dom  ( A  X.  B
)  e.  _V )
14 dmxp 4913 . . . . . . . . 9  |-  ( B  =/=  (/)  ->  dom  ( A  X.  B )  =  A )
1514eleq1d 2362 . . . . . . . 8  |-  ( B  =/=  (/)  ->  ( dom  ( A  X.  B
)  e.  _V  <->  A  e.  _V ) )
1613, 15syl5ib 210 . . . . . . 7  |-  ( B  =/=  (/)  ->  ( ( A  X.  B )  e. 
_V  ->  A  e.  _V ) )
1716con3d 125 . . . . . 6  |-  ( B  =/=  (/)  ->  ( -.  A  e.  _V  ->  -.  ( A  X.  B
)  e.  _V )
)
1817impcom 419 . . . . 5  |-  ( ( -.  A  e.  _V  /\  B  =/=  (/) )  ->  -.  ( A  X.  B
)  e.  _V )
19 fvprc 5535 . . . . 5  |-  ( -.  ( A  X.  B
)  e.  _V  ->  (  _I  `  ( A  X.  B ) )  =  (/) )
2018, 19syl 15 . . . 4  |-  ( ( -.  A  e.  _V  /\  B  =/=  (/) )  -> 
(  _I  `  ( A  X.  B ) )  =  (/) )
2112, 20pm2.61dane 2537 . . 3  |-  ( -.  A  e.  _V  ->  (  _I  `  ( A  X.  B ) )  =  (/) )
221, 3, 213eqtr4a 2354 . 2  |-  ( -.  A  e.  _V  ->  ( (  _I  `  A
)  X.  (  _I 
`  B ) )  =  (  _I  `  ( A  X.  B
) ) )
23 xp0 5114 . . 3  |-  ( (  _I  `  A )  X.  (/) )  =  (/)
24 fvprc 5535 . . . 4  |-  ( -.  B  e.  _V  ->  (  _I  `  B )  =  (/) )
2524xpeq2d 4729 . . 3  |-  ( -.  B  e.  _V  ->  ( (  _I  `  A
)  X.  (  _I 
`  B ) )  =  ( (  _I 
`  A )  X.  (/) ) )
26 simpr 447 . . . . . . . 8  |-  ( ( -.  B  e.  _V  /\  A  =  (/) )  ->  A  =  (/) )
2726xpeq1d 4728 . . . . . . 7  |-  ( ( -.  B  e.  _V  /\  A  =  (/) )  -> 
( A  X.  B
)  =  ( (/)  X.  B ) )
28 xp0r 4784 . . . . . . 7  |-  ( (/)  X.  B )  =  (/)
2927, 28syl6eq 2344 . . . . . 6  |-  ( ( -.  B  e.  _V  /\  A  =  (/) )  -> 
( A  X.  B
)  =  (/) )
3029fveq2d 5545 . . . . 5  |-  ( ( -.  B  e.  _V  /\  A  =  (/) )  -> 
(  _I  `  ( A  X.  B ) )  =  (  _I  `  (/) ) )
3130, 11syl6eq 2344 . . . 4  |-  ( ( -.  B  e.  _V  /\  A  =  (/) )  -> 
(  _I  `  ( A  X.  B ) )  =  (/) )
32 rnexg 4956 . . . . . . . 8  |-  ( ( A  X.  B )  e.  _V  ->  ran  ( A  X.  B
)  e.  _V )
33 rnxp 5122 . . . . . . . . 9  |-  ( A  =/=  (/)  ->  ran  ( A  X.  B )  =  B )
3433eleq1d 2362 . . . . . . . 8  |-  ( A  =/=  (/)  ->  ( ran  ( A  X.  B
)  e.  _V  <->  B  e.  _V ) )
3532, 34syl5ib 210 . . . . . . 7  |-  ( A  =/=  (/)  ->  ( ( A  X.  B )  e. 
_V  ->  B  e.  _V ) )
3635con3d 125 . . . . . 6  |-  ( A  =/=  (/)  ->  ( -.  B  e.  _V  ->  -.  ( A  X.  B
)  e.  _V )
)
3736impcom 419 . . . . 5  |-  ( ( -.  B  e.  _V  /\  A  =/=  (/) )  ->  -.  ( A  X.  B
)  e.  _V )
3837, 19syl 15 . . . 4  |-  ( ( -.  B  e.  _V  /\  A  =/=  (/) )  -> 
(  _I  `  ( A  X.  B ) )  =  (/) )
3931, 38pm2.61dane 2537 . . 3  |-  ( -.  B  e.  _V  ->  (  _I  `  ( A  X.  B ) )  =  (/) )
4023, 25, 393eqtr4a 2354 . 2  |-  ( -.  B  e.  _V  ->  ( (  _I  `  A
)  X.  (  _I 
`  B ) )  =  (  _I  `  ( A  X.  B
) ) )
41 fvi 5595 . . . 4  |-  ( A  e.  _V  ->  (  _I  `  A )  =  A )
42 fvi 5595 . . . 4  |-  ( B  e.  _V  ->  (  _I  `  B )  =  B )
43 xpeq12 4724 . . . 4  |-  ( ( (  _I  `  A
)  =  A  /\  (  _I  `  B )  =  B )  -> 
( (  _I  `  A )  X.  (  _I  `  B ) )  =  ( A  X.  B ) )
4441, 42, 43syl2an 463 . . 3  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  ( (  _I  `  A )  X.  (  _I  `  B ) )  =  ( A  X.  B ) )
45 xpexg 4816 . . . 4  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  ( A  X.  B
)  e.  _V )
46 fvi 5595 . . . 4  |-  ( ( A  X.  B )  e.  _V  ->  (  _I  `  ( A  X.  B ) )  =  ( A  X.  B
) )
4745, 46syl 15 . . 3  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  (  _I  `  ( A  X.  B ) )  =  ( A  X.  B ) )
4844, 47eqtr4d 2331 . 2  |-  ( ( A  e.  _V  /\  B  e.  _V )  ->  ( (  _I  `  A )  X.  (  _I  `  B ) )  =  (  _I  `  ( A  X.  B
) ) )
4922, 40, 48ecase 908 1  |-  ( (  _I  `  A )  X.  (  _I  `  B ) )  =  (  _I  `  ( A  X.  B ) )
Colors of variables: wff set class
Syntax hints:   -. wn 3    /\ wa 358    = wceq 1632    e. wcel 1696    =/= wne 2459   _Vcvv 2801   (/)c0 3468    _I cid 4320    X. cxp 4703   dom cdm 4705   ran crn 4706   ` cfv 5271
This theorem is referenced by:  txindis  17344
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-3 7  ax-mp 8  ax-gen 1536  ax-5 1547  ax-17 1606  ax-9 1644  ax-8 1661  ax-13 1698  ax-14 1700  ax-6 1715  ax-7 1720  ax-11 1727  ax-12 1878  ax-ext 2277  ax-sep 4157  ax-nul 4165  ax-pow 4204  ax-pr 4230  ax-un 4528
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3an 936  df-tru 1310  df-ex 1532  df-nf 1535  df-sb 1639  df-eu 2160  df-mo 2161  df-clab 2283  df-cleq 2289  df-clel 2292  df-nfc 2421  df-ne 2461  df-ral 2561  df-rex 2562  df-rab 2565  df-v 2803  df-sbc 3005  df-dif 3168  df-un 3170  df-in 3172  df-ss 3179  df-nul 3469  df-if 3579  df-pw 3640  df-sn 3659  df-pr 3660  df-op 3662  df-uni 3844  df-br 4040  df-opab 4094  df-id 4325  df-xp 4711  df-rel 4712  df-cnv 4713  df-co 4714  df-dm 4715  df-rn 4716  df-iota 5235  df-fun 5273  df-fv 5279
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