Theorem dfpred4 38502

Description: Alternate definition of the predecessor class when 𝑁 is a set. (Contributed by Peter Mazsa, 26-Jan-2026.)

Assertion

Ref	Expression
dfpred4	⊢ (𝑁 ∈ 𝑉 → Pred(𝑅, 𝐴, 𝑁) = [𝑁]◡(𝑅 ↾ 𝐴))

Proof of Theorem dfpred4

Dummy variable 𝑚 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		dfpred3g 6260	. 2 ⊢ (𝑁 ∈ 𝑉 → Pred(𝑅, 𝐴, 𝑁) = {𝑚 ∈ 𝐴 ∣ 𝑚𝑅𝑁})
2		ec1cnvres 38318	. 2 ⊢ (𝑁 ∈ 𝑉 → [𝑁]◡(𝑅 ↾ 𝐴) = {𝑚 ∈ 𝐴 ∣ 𝑚𝑅𝑁})
3	1, 2	eqtr4d 2769	1 ⊢ (𝑁 ∈ 𝑉 → Pred(𝑅, 𝐴, 𝑁) = [𝑁]◡(𝑅 ↾ 𝐴))

Syntax hints:   → wi 4   = wceq 1541   ∈ wcel 2111  {crab 3395   class class class wbr 5089  ^◡ccnv 5613   ↾ cres 5616  Predcpred 6247  [cec 8620

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1968  ax-7 2009  ax-8 2113  ax-9 2121  ax-ext 2703  ax-sep 5232  ax-nul 5242  ax-pr 5368

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1544  df-fal 1554  df-ex 1781  df-sb 2068  df-clab 2710  df-cleq 2723  df-clel 2806  df-ral 3048  df-rex 3057  df-rab 3396  df-v 3438  df-dif 3900  df-un 3902  df-in 3904  df-ss 3914  df-nul 4281  df-if 4473  df-sn 4574  df-pr 4576  df-op 4580  df-br 5090  df-opab 5152  df-xp 5620  df-rel 5621  df-cnv 5622  df-dm 5624  df-rn 5625  df-res 5626  df-ima 5627  df-pred 6248  df-ec 8624

This theorem is referenced by:  dfpre4  38503