Theorem predeq3 6281

Description: Equality theorem for the predecessor class. (Contributed by Scott Fenton, 2-Feb-2011.)

Assertion

Ref	Expression
predeq3	⊢ (𝑋 = 𝑌 → Pred(𝑅, 𝐴, 𝑋) = Pred(𝑅, 𝐴, 𝑌))

Proof of Theorem predeq3

Step	Hyp	Ref	Expression
1		eqid 2730	. 2 ⊢ 𝑅 = 𝑅
2		eqid 2730	. 2 ⊢ 𝐴 = 𝐴
3		predeq123 6278	. 2 ⊢ ((𝑅 = 𝑅 ∧ 𝐴 = 𝐴 ∧ 𝑋 = 𝑌) → Pred(𝑅, 𝐴, 𝑋) = Pred(𝑅, 𝐴, 𝑌))
4	1, 2, 3	mp3an12 1453	1 ⊢ (𝑋 = 𝑌 → Pred(𝑅, 𝐴, 𝑋) = Pred(𝑅, 𝐴, 𝑌))

Syntax hints:   → wi 4   = wceq 1540  Predcpred 6276

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1795  ax-4 1809  ax-5 1910  ax-6 1967  ax-7 2008  ax-8 2111  ax-9 2119  ax-ext 2702

This theorem depends on definitions:  df-bi 207  df-an 396  df-or 848  df-3an 1088  df-tru 1543  df-fal 1553  df-ex 1780  df-sb 2066  df-clab 2709  df-cleq 2722  df-clel 2804  df-rab 3409  df-v 3452  df-dif 3920  df-un 3922  df-in 3924  df-ss 3934  df-nul 4300  df-if 4492  df-sn 4593  df-pr 4595  df-op 4599  df-br 5111  df-opab 5173  df-xp 5647  df-cnv 5649  df-dm 5651  df-rn 5652  df-res 5653  df-ima 5654  df-pred 6277

This theorem is referenced by:  dfpred3g  6289  preddowncl  6308  frpoinsg  6319  frpoins3xpg  8122  frpoins3xp3g  8123  xpord2pred  8127  sexp2  8128  xpord3pred  8134  sexp3  8135  csbfrecsg  8266  fpr3g  8267  frrlem1  8268  frrlem12  8279  frrlem13  8280  fpr2a  8284  frrdmcl  8290  fprresex  8292  wfr3g  8301  ttrclselem1  9685  ttrclselem2  9686  frmin  9709  frinsg  9711  frr3g  9716  frr2  9720  elwlim  35818