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Theorem fndmdifcom 5325
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 2333 . . . 4 ((𝐹𝑥) ≠ (𝐺𝑥) ↔ (𝐺𝑥) ≠ (𝐹𝑥))
21a1i 9 . . 3 (𝑥𝐴 → ((𝐹𝑥) ≠ (𝐺𝑥) ↔ (𝐺𝑥) ≠ (𝐹𝑥)))
32rabbiia 2596 . 2 {𝑥𝐴 ∣ (𝐹𝑥) ≠ (𝐺𝑥)} = {𝑥𝐴 ∣ (𝐺𝑥) ≠ (𝐹𝑥)}
4 fndmdif 5324 . 2 ((𝐹 Fn 𝐴𝐺 Fn 𝐴) → dom (𝐹𝐺) = {𝑥𝐴 ∣ (𝐹𝑥) ≠ (𝐺𝑥)})
5 fndmdif 5324 . . 3 ((𝐺 Fn 𝐴𝐹 Fn 𝐴) → dom (𝐺𝐹) = {𝑥𝐴 ∣ (𝐺𝑥) ≠ (𝐹𝑥)})
65ancoms 264 . 2 ((𝐹 Fn 𝐴𝐺 Fn 𝐴) → dom (𝐺𝐹) = {𝑥𝐴 ∣ (𝐺𝑥) ≠ (𝐹𝑥)})
73, 4, 63eqtr4a 2141 1 ((𝐹 Fn 𝐴𝐺 Fn 𝐴) → dom (𝐹𝐺) = dom (𝐺𝐹))
Colors of variables: wff set class
Syntax hints:  wi 4  wa 102  wb 103   = wceq 1285  wcel 1434  wne 2249  {crab 2357  cdif 2979  dom cdm 4391   Fn wfn 4947  cfv 4952
This theorem was proved from axioms:  ax-1 5  ax-2 6  ax-mp 7  ax-ia1 104  ax-ia2 105  ax-ia3 106  ax-in1 577  ax-in2 578  ax-io 663  ax-5 1377  ax-7 1378  ax-gen 1379  ax-ie1 1423  ax-ie2 1424  ax-8 1436  ax-10 1437  ax-11 1438  ax-i12 1439  ax-bndl 1440  ax-4 1441  ax-14 1446  ax-17 1460  ax-i9 1464  ax-ial 1468  ax-i5r 1469  ax-ext 2065  ax-sep 3916  ax-pow 3968  ax-pr 3992
This theorem depends on definitions:  df-bi 115  df-3an 922  df-tru 1288  df-nf 1391  df-sb 1688  df-eu 1946  df-mo 1947  df-clab 2070  df-cleq 2076  df-clel 2079  df-nfc 2212  df-ne 2250  df-ral 2358  df-rex 2359  df-rab 2362  df-v 2612  df-sbc 2825  df-dif 2984  df-un 2986  df-in 2988  df-ss 2995  df-pw 3402  df-sn 3422  df-pr 3423  df-op 3425  df-uni 3622  df-br 3806  df-opab 3860  df-id 4076  df-xp 4397  df-rel 4398  df-cnv 4399  df-co 4400  df-dm 4401  df-iota 4917  df-fun 4954  df-fn 4955  df-fv 4960
This theorem is referenced by: (None)
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