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Theorem dfrel3 5245
Description: Alternate definition of relation. (Contributed by NM, 14-May-2008.)
Assertion
Ref Expression
dfrel3 (Rel 𝑅 ↔ (𝑅 ↾ V) = 𝑅)

Proof of Theorem dfrel3
StepHypRef Expression
1 dfrel2 5238 . 2 (Rel 𝑅𝑅 = 𝑅)
2 cnvcnv2 5241 . . 3 𝑅 = (𝑅 ↾ V)
32eqeq1i 2246 . 2 (𝑅 = 𝑅 ↔ (𝑅 ↾ V) = 𝑅)
41, 3bitri 184 1 (Rel 𝑅 ↔ (𝑅 ↾ V) = 𝑅)
Colors of variables:    wff set class
This proof depends on syntax axioms:  wb 105   = wceq 1402  Vcvv 2821  ccnv 4773  cres 4776  Rel wrel 4779
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 721  ax-5 1500  ax-7 1501  ax-gen 1502  ax-ie1 1546  ax-ie2 1547  ax-8 1557  ax-10 1558  ax-11 1559  ax-i12 1560  ax-bndl 1562  ax-4 1563  ax-17 1579  ax-i9 1583  ax-ial 1587  ax-i5r 1588  ax-14 2212  ax-ext 2220  ax-sep 4249  ax-pow 4311  ax-pr 4346
This proof depends on definitions:  df-bi 117  df-3an 1011  df-tru 1405  df-nf 1514  df-sb 1816  df-eu 2089  df-mo 2090  df-clab 2225  df-cleq 2231  df-clel 2234  df-nfc 2381  df-ral 2533  df-rex 2534  df-v 2823  df-un 3224  df-in 3226  df-ss 3233  df-pw 3690  df-sn 3715  df-pr 3716  df-op 3718  df-br 4131  df-opab 4193  df-xp 4780  df-rel 4781  df-cnv 4782  df-res 4786
This theorem is used by:  cocnvcnv2  5299  f1ovi  5680
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