Theorem f0cli 6866

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 6852	. 2 ⊢ (𝐶 ∈ 𝐴 → (𝐹‘𝐶) ∈ 𝐵)
3	1	fdmi 6526	. . . 4 ⊢ dom 𝐹 = 𝐴
4	3	eleq2i 2906	. . 3 ⊢ (𝐶 ∈ dom 𝐹 ↔ 𝐶 ∈ 𝐴)
5		ndmfv 6702	. . . 4 ⊢ (¬ 𝐶 ∈ dom 𝐹 → (𝐹‘𝐶) = ∅)
6		f0cl.2	. . . 4 ⊢ ∅ ∈ 𝐵
7	5, 6	eqeltrdi 2923	. . 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 2114  ∅c0 4293  dom cdm 5557  ⟶wf 6353  ‘cfv 6357

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1796  ax-4 1810  ax-5 1911  ax-6 1970  ax-7 2015  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2161  ax-12 2177  ax-ext 2795  ax-sep 5205  ax-nul 5212  ax-pow 5268  ax-pr 5332

This theorem depends on definitions:  df-bi 209  df-an 399  df-or 844  df-3an 1085  df-tru 1540  df-ex 1781  df-nf 1785  df-sb 2070  df-mo 2622  df-eu 2654  df-clab 2802  df-cleq 2816  df-clel 2895  df-nfc 2965  df-ral 3145  df-rex 3146  df-rab 3149  df-v 3498  df-sbc 3775  df-dif 3941  df-un 3943  df-in 3945  df-ss 3954  df-nul 4294  df-if 4470  df-sn 4570  df-pr 4572  df-op 4576  df-uni 4841  df-br 5069  df-opab 5131  df-id 5462  df-xp 5563  df-rel 5564  df-cnv 5565  df-co 5566  df-dm 5567  df-rn 5568  df-iota 6316  df-fun 6359  df-fn 6360  df-f 6361  df-fv 6365

This theorem is referenced by:  harcl  9027  cantnfvalf  9130  rankon  9226  cardon  9375  alephon  9497  ackbij1lem13  9656  ackbij1b  9663  ixxssxr  12753  sadcf  15804  smupf  15829  iccordt  21824  nodense  33198  bdayelon  33248