Theorem eceq1 4283

Description: Equality theorem for equivalence class.

Assertion

Ref	Expression
eceq1	|- (A = B -> [C]A = [C]B)

Proof of Theorem eceq1

Step	Hyp	Ref	Expression
1		imaeq1 3407	. 2 |- (A = B -> (A"{C}) = (B"{C}))
2		df-ec 4269	. 2 |- [C]A = (A"{C})
3		df-ec 4269	. 2 |- [C]B = (B"{C})
4	1, 2, 3	3eqtr4g 1534	1 |- (A = B -> [C]A = [C]B)

Syntax hints:   -> wi 3   = wceq 958  {csn 2413  "cima 3179  [cec 4265

This theorem is referenced by:  qseq2 4295  erdisj2 10437

This theorem was proved from axioms:  ax-1 4  ax-2 5  ax-3 6  ax-mp 7  ax-7 964  ax-gen 965  ax-8 966  ax-10 968  ax-11 969  ax-12 970  ax-13 971  ax-14 972  ax-17 973  ax-4 975  ax-5o 977  ax-6o 980  ax-9o 1125  ax-10o 1142  ax-16 1212  ax-11o 1220  ax-ext 1462  ax-sep 2708  ax-pow 2748  ax-pr 2785

This theorem depends on definitions:  df-bi 147  df-or 224  df-an 225  df-ex 983  df-sb 1174  df-eu 1384  df-mo 1385  df-clab 1467  df-cleq 1472  df-clel 1475  df-ne 1590  df-v 1815  df-dif 2052  df-un 2053  df-in 2054  df-ss 2056  df-nul 2284  df-pw 2406  df-sn 2416  df-pr 2417  df-op 2420  df-br 2625  df-opab 2672  df-cnv 3192  df-dm 3194  df-rn 3195  df-res 3196  df-ima 3197  df-ec 4269

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