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Theorem releq 5235
 Description: Equality theorem for the relation predicate. (Contributed by NM, 1-Aug-1994.)
Assertion
Ref Expression
releq (𝐴 = 𝐵 → (Rel 𝐴 ↔ Rel 𝐵))

Proof of Theorem releq
StepHypRef Expression
1 sseq1 3659 . 2 (𝐴 = 𝐵 → (𝐴 ⊆ (V × V) ↔ 𝐵 ⊆ (V × V)))
2 df-rel 5150 . 2 (Rel 𝐴𝐴 ⊆ (V × V))
3 df-rel 5150 . 2 (Rel 𝐵𝐵 ⊆ (V × V))
41, 2, 33bitr4g 303 1 (𝐴 = 𝐵 → (Rel 𝐴 ↔ Rel 𝐵))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 196   = wceq 1523  Vcvv 3231   ⊆ wss 3607   × cxp 5141  Rel wrel 5148 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1762  ax-4 1777  ax-5 1879  ax-6 1945  ax-7 1981  ax-9 2039  ax-10 2059  ax-11 2074  ax-12 2087  ax-13 2282  ax-ext 2631 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-tru 1526  df-ex 1745  df-nf 1750  df-sb 1938  df-clab 2638  df-cleq 2644  df-clel 2647  df-in 3614  df-ss 3621  df-rel 5150 This theorem is referenced by:  releqi  5236  releqd  5237  dfrel2  5618  tposfn2  7419  ereq1  7794  isps  17249  isdir  17279  fpwrelmapffslem  29635  bnj1321  31221  refreleq  34410  symreleq  34444  prtlem12  34471  relintabex  38204  clrellem  38246  clcnvlem  38247
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