Theorem dfrel3 5510

Description: Alternate definition of relation. (Contributed by NM, 14-May-2008.)

Assertion

Ref	Expression
dfrel3	⊢ (Rel 𝑅 ↔ (𝑅 ↾ V) = 𝑅)

Proof of Theorem dfrel3

Step	Hyp	Ref	Expression
1		dfrel2 5502	. 2 ⊢ (Rel 𝑅 ↔ ◡◡𝑅 = 𝑅)
2		cnvcnv2 5506	. . 3 ⊢ ◡◡𝑅 = (𝑅 ↾ V)
3	2	eqeq1i 2615	. 2 ⊢ (◡◡𝑅 = 𝑅 ↔ (𝑅 ↾ V) = 𝑅)
4	1, 3	bitri 263	1 ⊢ (Rel 𝑅 ↔ (𝑅 ↾ V) = 𝑅)

Syntax hints:   ↔ wb 195   = wceq 1475  Vcvv 3173  ^◡ccnv 5037   ↾ cres 5040  Rel wrel 5043

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1713  ax-4 1728  ax-5 1827  ax-6 1875  ax-7 1922  ax-9 1986  ax-10 2006  ax-11 2021  ax-12 2034  ax-13 2234  ax-ext 2590  ax-sep 4709  ax-nul 4717  ax-pr 4833

This theorem depends on definitions:  df-bi 196  df-or 384  df-an 385  df-3an 1033  df-tru 1478  df-ex 1696  df-nf 1701  df-sb 1868  df-eu 2462  df-mo 2463  df-clab 2597  df-cleq 2603  df-clel 2606  df-nfc 2740  df-ral 2901  df-rab 2905  df-v 3175  df-dif 3543  df-un 3545  df-in 3547  df-ss 3554  df-nul 3875  df-if 4037  df-sn 4126  df-pr 4128  df-op 4132  df-br 4584  df-opab 4644  df-xp 5044  df-rel 5045  df-cnv 5046  df-res 5050

This theorem is referenced by:  cocnvcnv2  5564  f1ovi  6087