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Theorem fnresdisj 5193
 Description: A function restricted to a class disjoint with its domain is empty. (Contributed by set.mm contributors, 23-Sep-2004.)
Assertion
Ref Expression
fnresdisj (F Fn A → ((AB) = ↔ (F B) = ))

Proof of Theorem fnresdisj
StepHypRef Expression
1 dmeq0 4922 . 2 ((F B) = ↔ dom (F B) = )
2 dmres 4986 . . . . 5 dom (F B) = (B ∩ dom F)
3 incom 3448 . . . . 5 (B ∩ dom F) = (dom FB)
42, 3eqtri 2373 . . . 4 dom (F B) = (dom FB)
5 fndm 5182 . . . . 5 (F Fn A → dom F = A)
65ineq1d 3456 . . . 4 (F Fn A → (dom FB) = (AB))
74, 6syl5eq 2397 . . 3 (F Fn A → dom (F B) = (AB))
87eqeq1d 2361 . 2 (F Fn A → (dom (F B) = ↔ (AB) = ))
91, 8syl5rbb 249 1 (F Fn A → ((AB) = ↔ (F B) = ))
 Colors of variables: wff setvar class Syntax hints:   → wi 4   ↔ wb 176   = wceq 1642   ∩ cin 3208  ∅c0 3550  dom cdm 4772   ↾ cres 4774   Fn wfn 4776 This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1546  ax-5 1557  ax-17 1616  ax-9 1654  ax-8 1675  ax-13 1712  ax-14 1714  ax-6 1729  ax-7 1734  ax-11 1746  ax-12 1925  ax-ext 2334  ax-nin 4078  ax-xp 4079  ax-cnv 4080  ax-1c 4081  ax-sset 4082  ax-si 4083  ax-ins2 4084  ax-ins3 4085  ax-typlower 4086  ax-sn 4087 This theorem depends on definitions:  df-bi 177  df-or 359  df-an 360  df-3or 935  df-3an 936  df-nan 1288  df-tru 1319  df-ex 1542  df-nf 1545  df-sb 1649  df-eu 2208  df-mo 2209  df-clab 2340  df-cleq 2346  df-clel 2349  df-nfc 2478  df-ne 2518  df-ral 2619  df-rex 2620  df-reu 2621  df-rmo 2622  df-rab 2623  df-v 2861  df-sbc 3047  df-nin 3211  df-compl 3212  df-in 3213  df-un 3214  df-dif 3215  df-symdif 3216  df-ss 3259  df-pss 3261  df-nul 3551  df-if 3663  df-pw 3724  df-sn 3741  df-pr 3742  df-uni 3892  df-int 3927  df-opk 4058  df-1c 4136  df-pw1 4137  df-uni1 4138  df-xpk 4185  df-cnvk 4186  df-ins2k 4187  df-ins3k 4188  df-imak 4189  df-cok 4190  df-p6 4191  df-sik 4192  df-ssetk 4193  df-imagek 4194  df-idk 4195  df-iota 4339  df-0c 4377  df-addc 4378  df-nnc 4379  df-fin 4380  df-lefin 4440  df-ltfin 4441  df-ncfin 4442  df-tfin 4443  df-evenfin 4444  df-oddfin 4445  df-sfin 4446  df-spfin 4447  df-phi 4565  df-op 4566  df-proj1 4567  df-proj2 4568  df-opab 4623  df-br 4640  df-ima 4727  df-xp 4784  df-cnv 4785  df-rn 4786  df-dm 4787  df-res 4788  df-fn 4790 This theorem is referenced by:  fvsnun2  5448
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