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Theorem refssex 20538
 Description: Every set in a refinement has a superset in the original cover. (Contributed by Jeff Hankins, 18-Jan-2010.) (Revised by Thierry Arnoux, 3-Feb-2020.)
Assertion
Ref Expression
refssex
Distinct variable groups:   ,   ,
Allowed substitution hint:   ()

Proof of Theorem refssex
Dummy variable is distinct from all other variables.
StepHypRef Expression
1 refrel 20535 . . . . 5
21brrelexi 4878 . . . 4
3 eqid 2453 . . . . . 6
4 eqid 2453 . . . . . 6
53, 4isref 20536 . . . . 5
65simplbda 630 . . . 4
72, 6mpancom 676 . . 3
8 sseq1 3455 . . . . 5
98rexbidv 2903 . . . 4
109rspccv 3149 . . 3
117, 10syl 17 . 2
1211imp 431 1
 Colors of variables: wff setvar class Syntax hints:   wi 4   wa 371   wceq 1446   wcel 1889  wral 2739  wrex 2740  cvv 3047   wss 3406  cuni 4201   class class class wbr 4405  cref 20529 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1671  ax-4 1684  ax-5 1760  ax-6 1807  ax-7 1853  ax-8 1891  ax-9 1898  ax-10 1917  ax-11 1922  ax-12 1935  ax-13 2093  ax-ext 2433  ax-sep 4528  ax-nul 4537  ax-pow 4584  ax-pr 4642  ax-un 6588 This theorem depends on definitions:  df-bi 189  df-or 372  df-an 373  df-3an 988  df-tru 1449  df-ex 1666  df-nf 1670  df-sb 1800  df-eu 2305  df-mo 2306  df-clab 2440  df-cleq 2446  df-clel 2449  df-nfc 2583  df-ne 2626  df-ral 2744  df-rex 2745  df-rab 2748  df-v 3049  df-dif 3409  df-un 3411  df-in 3413  df-ss 3420  df-nul 3734  df-if 3884  df-pw 3955  df-sn 3971  df-pr 3973  df-op 3977  df-uni 4202  df-br 4406  df-opab 4465  df-xp 4843  df-rel 4844  df-ref 20532 This theorem is referenced by:  reftr  20541  refun0  20542  refssfne  31026
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