Theorem f10d 6647

Description: The empty set maps one-to-one into any class, deduction version. (Contributed by AV, 25-Nov-2020.)

Hypothesis

Ref	Expression
f10d.f	⊢ (𝜑 → 𝐹 = ∅)

Assertion

Ref	Expression
f10d	⊢ (𝜑 → 𝐹:dom 𝐹–1-1→𝐴)

Proof of Theorem f10d

Step	Hyp	Ref	Expression
1		f10 6646	. . 3 ⊢ ∅:∅–1-1→𝐴
2		dm0 5789	. . . 4 ⊢ dom ∅ = ∅
3		f1eq2 6570	. . . 4 ⊢ (dom ∅ = ∅ → (∅:dom ∅–1-1→𝐴 ↔ ∅:∅–1-1→𝐴))
4	2, 3	ax-mp 5	. . 3 ⊢ (∅:dom ∅–1-1→𝐴 ↔ ∅:∅–1-1→𝐴)
5	1, 4	mpbir 233	. 2 ⊢ ∅:dom ∅–1-1→𝐴
6		f10d.f	. . 3 ⊢ (𝜑 → 𝐹 = ∅)
7	6	dmeqd 5773	. . 3 ⊢ (𝜑 → dom 𝐹 = dom ∅)
8		eqidd 2822	. . 3 ⊢ (𝜑 → 𝐴 = 𝐴)
9	6, 7, 8	f1eq123d 6607	. 2 ⊢ (𝜑 → (𝐹:dom 𝐹–1-1→𝐴 ↔ ∅:dom ∅–1-1→𝐴))
10	5, 9	mpbiri 260	1 ⊢ (𝜑 → 𝐹:dom 𝐹–1-1→𝐴)

Syntax hints:   → wi 4   ↔ wb 208   = wceq 1533  ∅c0 4290  dom cdm 5554  –1-1→wf1 6351

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-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-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-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-fun 6356  df-fn 6357  df-f 6358  df-f1 6359

This theorem is referenced by:  umgr0e  26894  usgr0e  27017