Theorem f0cli 6863

Description: Unconditional closure of a function when the range includes the empty set. (Contributed by Mario Carneiro, 12-Sep-2013.)

Hypotheses

Ref	Expression
f0cl.1	⊢ 𝐹:𝐴⟶𝐵
f0cl.2	⊢ ∅ ∈ 𝐵

Assertion

Ref	Expression
f0cli	⊢ (𝐹‘𝐶) ∈ 𝐵

Proof of Theorem f0cli

Step	Hyp	Ref	Expression
1		f0cl.1	. . 3 ⊢ 𝐹:𝐴⟶𝐵
2	1	ffvelrni 6849	. 2 ⊢ (𝐶 ∈ 𝐴 → (𝐹‘𝐶) ∈ 𝐵)
3	1	fdmi 6523	. . . 4 ⊢ dom 𝐹 = 𝐴
4	3	eleq2i 2904	. . 3 ⊢ (𝐶 ∈ dom 𝐹 ↔ 𝐶 ∈ 𝐴)
5		ndmfv 6699	. . . 4 ⊢ (¬ 𝐶 ∈ dom 𝐹 → (𝐹‘𝐶) = ∅)
6		f0cl.2	. . . 4 ⊢ ∅ ∈ 𝐵
7	5, 6	eqeltrdi 2921	. . 3 ⊢ (¬ 𝐶 ∈ dom 𝐹 → (𝐹‘𝐶) ∈ 𝐵)
8	4, 7	sylnbir 333	. 2 ⊢ (¬ 𝐶 ∈ 𝐴 → (𝐹‘𝐶) ∈ 𝐵)
9	2, 8	pm2.61i 184	1 ⊢ (𝐹‘𝐶) ∈ 𝐵

Syntax hints:  ¬ wn 3   ∈ wcel 2110  ∅c0 4290  dom cdm 5554  ⟶wf 6350  ‘cfv 6354

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1792  ax-4 1806  ax-5 1907  ax-6 1966  ax-7 2011  ax-8 2112  ax-9 2120  ax-10 2141  ax-11 2157  ax-12 2173  ax-ext 2793  ax-sep 5202  ax-nul 5209  ax-pow 5265  ax-pr 5329

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1536  df-ex 1777  df-nf 1781  df-sb 2066  df-mo 2618  df-eu 2650  df-clab 2800  df-cleq 2814  df-clel 2893  df-nfc 2963  df-ral 3143  df-rex 3144  df-rab 3147  df-v 3496  df-sbc 3772  df-dif 3938  df-un 3940  df-in 3942  df-ss 3951  df-nul 4291  df-if 4467  df-sn 4567  df-pr 4569  df-op 4573  df-uni 4838  df-br 5066  df-opab 5128  df-id 5459  df-xp 5560  df-rel 5561  df-cnv 5562  df-co 5563  df-dm 5564  df-rn 5565  df-iota 6313  df-fun 6356  df-fn 6357  df-f 6358  df-fv 6362

This theorem is referenced by:  harcl  9024  cantnfvalf  9127  rankon  9223  cardon  9372  alephon  9494  ackbij1lem13  9653  ackbij1b  9660  ixxssxr  12749  sadcf  15801  smupf  15826  iccordt  21821  nodense  33196  bdayelon  33246