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Theorem paddidm 30030
Description: Projective subspace sum is idempotent. Part of Lemma 16.2 of [MaedaMaeda] p. 68. (Contributed by NM, 13-Jan-2012.)
Hypotheses
Ref Expression
paddidm.s  |-  S  =  ( PSubSp `  K )
paddidm.p  |-  .+  =  ( + P `  K
)
Assertion
Ref Expression
paddidm  |-  ( ( K  e.  B  /\  X  e.  S )  ->  ( X  .+  X
)  =  X )

Proof of Theorem paddidm
Dummy variables  p  q  r are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 simpl 443 . . . . 5  |-  ( ( K  e.  B  /\  X  e.  S )  ->  K  e.  B )
2 eqid 2283 . . . . . 6  |-  ( Atoms `  K )  =  (
Atoms `  K )
3 paddidm.s . . . . . 6  |-  S  =  ( PSubSp `  K )
42, 3psubssat 29943 . . . . 5  |-  ( ( K  e.  B  /\  X  e.  S )  ->  X  C_  ( Atoms `  K ) )
5 eqid 2283 . . . . . 6  |-  ( le
`  K )  =  ( le `  K
)
6 eqid 2283 . . . . . 6  |-  ( join `  K )  =  (
join `  K )
7 paddidm.p . . . . . 6  |-  .+  =  ( + P `  K
)
85, 6, 2, 7elpadd 29988 . . . . 5  |-  ( ( K  e.  B  /\  X  C_  ( Atoms `  K
)  /\  X  C_  ( Atoms `  K ) )  ->  ( p  e.  ( X  .+  X
)  <->  ( ( p  e.  X  \/  p  e.  X )  \/  (
p  e.  ( Atoms `  K )  /\  E. q  e.  X  E. r  e.  X  p
( le `  K
) ( q (
join `  K )
r ) ) ) ) )
91, 4, 4, 8syl3anc 1182 . . . 4  |-  ( ( K  e.  B  /\  X  e.  S )  ->  ( p  e.  ( X  .+  X )  <-> 
( ( p  e.  X  \/  p  e.  X )  \/  (
p  e.  ( Atoms `  K )  /\  E. q  e.  X  E. r  e.  X  p
( le `  K
) ( q (
join `  K )
r ) ) ) ) )
10 pm1.2 499 . . . . . 6  |-  ( ( p  e.  X  \/  p  e.  X )  ->  p  e.  X )
1110a1i 10 . . . . 5  |-  ( ( K  e.  B  /\  X  e.  S )  ->  ( ( p  e.  X  \/  p  e.  X )  ->  p  e.  X ) )
125, 6, 2, 3psubspi 29936 . . . . . . 7  |-  ( ( ( K  e.  B  /\  X  e.  S  /\  p  e.  ( Atoms `  K ) )  /\  E. q  e.  X  E. r  e.  X  p ( le
`  K ) ( q ( join `  K
) r ) )  ->  p  e.  X
)
13123exp1 1167 . . . . . 6  |-  ( K  e.  B  ->  ( X  e.  S  ->  ( p  e.  ( Atoms `  K )  ->  ( E. q  e.  X  E. r  e.  X  p ( le `  K ) ( q ( join `  K
) r )  ->  p  e.  X )
) ) )
1413imp4b 573 . . . . 5  |-  ( ( K  e.  B  /\  X  e.  S )  ->  ( ( p  e.  ( Atoms `  K )  /\  E. q  e.  X  E. r  e.  X  p ( le `  K ) ( q ( join `  K
) r ) )  ->  p  e.  X
) )
1511, 14jaod 369 . . . 4  |-  ( ( K  e.  B  /\  X  e.  S )  ->  ( ( ( p  e.  X  \/  p  e.  X )  \/  (
p  e.  ( Atoms `  K )  /\  E. q  e.  X  E. r  e.  X  p
( le `  K
) ( q (
join `  K )
r ) ) )  ->  p  e.  X
) )
169, 15sylbid 206 . . 3  |-  ( ( K  e.  B  /\  X  e.  S )  ->  ( p  e.  ( X  .+  X )  ->  p  e.  X
) )
1716ssrdv 3185 . 2  |-  ( ( K  e.  B  /\  X  e.  S )  ->  ( X  .+  X
)  C_  X )
182, 7sspadd1 30004 . . 3  |-  ( ( K  e.  B  /\  X  C_  ( Atoms `  K
)  /\  X  C_  ( Atoms `  K ) )  ->  X  C_  ( X  .+  X ) )
191, 4, 4, 18syl3anc 1182 . 2  |-  ( ( K  e.  B  /\  X  e.  S )  ->  X  C_  ( X  .+  X ) )
2017, 19eqssd 3196 1  |-  ( ( K  e.  B  /\  X  e.  S )  ->  ( X  .+  X
)  =  X )
Colors of variables: wff set class
Syntax hints:    -> wi 4    <-> wb 176    \/ wo 357    /\ wa 358    = wceq 1623    e. wcel 1684   E.wrex 2544    C_ wss 3152   class class class wbr 4023   ` cfv 5255  (class class class)co 5858   lecple 13215   joincjn 14078   Atomscatm 29453   PSubSpcpsubsp 29685   + Pcpadd 29984
This theorem is referenced by:  paddclN  30031  paddss  30034  pmod1i  30037
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-rep 4131  ax-sep 4141  ax-nul 4149  ax-pow 4188  ax-pr 4214  ax-un 4512
This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  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-ral 2548  df-rex 2549  df-reu 2550  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-iun 3907  df-br 4024  df-opab 4078  df-mpt 4079  df-id 4309  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-1st 6122  df-2nd 6123  df-psubsp 29692  df-padd 29985
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