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Theorem fndmdifcom 6486
 Description: The difference set between two functions is commutative. (Contributed by Stefan O'Rear, 17-Jan-2015.)
Assertion
Ref Expression
fndmdifcom ((𝐹 Fn 𝐴𝐺 Fn 𝐴) → dom (𝐹𝐺) = dom (𝐺𝐹))

Proof of Theorem fndmdifcom
Dummy variable 𝑥 is distinct from all other variables.
StepHypRef Expression
1 necom 2985 . . 3 ((𝐹𝑥) ≠ (𝐺𝑥) ↔ (𝐺𝑥) ≠ (𝐹𝑥))
21rabbii 3325 . 2 {𝑥𝐴 ∣ (𝐹𝑥) ≠ (𝐺𝑥)} = {𝑥𝐴 ∣ (𝐺𝑥) ≠ (𝐹𝑥)}
3 fndmdif 6485 . 2 ((𝐹 Fn 𝐴𝐺 Fn 𝐴) → dom (𝐹𝐺) = {𝑥𝐴 ∣ (𝐹𝑥) ≠ (𝐺𝑥)})
4 fndmdif 6485 . . 3 ((𝐺 Fn 𝐴𝐹 Fn 𝐴) → dom (𝐺𝐹) = {𝑥𝐴 ∣ (𝐺𝑥) ≠ (𝐹𝑥)})
54ancoms 468 . 2 ((𝐹 Fn 𝐴𝐺 Fn 𝐴) → dom (𝐺𝐹) = {𝑥𝐴 ∣ (𝐺𝑥) ≠ (𝐹𝑥)})
62, 3, 53eqtr4a 2820 1 ((𝐹 Fn 𝐴𝐺 Fn 𝐴) → dom (𝐹𝐺) = dom (𝐺𝐹))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ∧ wa 383   = wceq 1632   ≠ wne 2932  {crab 3054   ∖ cdif 3712  dom cdm 5266   Fn wfn 6044  ‘cfv 6049 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1871  ax-4 1886  ax-5 1988  ax-6 2054  ax-7 2090  ax-9 2148  ax-10 2168  ax-11 2183  ax-12 2196  ax-13 2391  ax-ext 2740  ax-sep 4933  ax-nul 4941  ax-pr 5055 This theorem depends on definitions:  df-bi 197  df-or 384  df-an 385  df-3an 1074  df-tru 1635  df-ex 1854  df-nf 1859  df-sb 2047  df-eu 2611  df-mo 2612  df-clab 2747  df-cleq 2753  df-clel 2756  df-nfc 2891  df-ne 2933  df-ral 3055  df-rex 3056  df-rab 3059  df-v 3342  df-sbc 3577  df-dif 3718  df-un 3720  df-in 3722  df-ss 3729  df-nul 4059  df-if 4231  df-sn 4322  df-pr 4324  df-op 4328  df-uni 4589  df-br 4805  df-opab 4865  df-id 5174  df-xp 5272  df-rel 5273  df-cnv 5274  df-co 5275  df-dm 5276  df-iota 6012  df-fun 6051  df-fn 6052  df-fv 6057 This theorem is referenced by: (None)
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