Theorem f10d 6808

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 6807	. . 3 ⊢ ∅:∅–1-1→𝐴
2		dm0 5869	. . . 4 ⊢ dom ∅ = ∅
3		f1eq2 6726	. . . 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 232	. 2 ⊢ ∅:dom ∅–1-1→𝐴
6		f10d.f	. . 3 ⊢ (𝜑 → 𝐹 = ∅)
7	6	dmeqd 5854	. . 3 ⊢ (𝜑 → dom 𝐹 = dom ∅)
8		eqidd 2741	. . 3 ⊢ (𝜑 → 𝐴 = 𝐴)
9	6, 7, 8	f1eq123d 6766	. 2 ⊢ (𝜑 → (𝐹:dom 𝐹–1-1→𝐴 ↔ ∅:dom ∅–1-1→𝐴))
10	5, 9	mpbiri 259	1 ⊢ (𝜑 → 𝐹:dom 𝐹–1-1→𝐴)

Syntax hints:   → wi 4   ↔ wb 207   = wceq 1547  ∅c0 4268  dom cdm 5625  –1-1→wf1 6489

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1974  ax-7 2015  ax-8 2121  ax-9 2129  ax-ext 2712  ax-sep 5225  ax-nul 5235  ax-pr 5369

This theorem depends on definitions:  df-bi 208  df-an 397  df-or 854  df-3an 1094  df-tru 1550  df-fal 1560  df-ex 1787  df-sb 2074  df-mo 2543  df-clab 2719  df-cleq 2732  df-clel 2815  df-ral 3055  df-rex 3065  df-rab 3393  df-v 3434  df-dif 3893  df-un 3895  df-in 3897  df-ss 3907  df-nul 4269  df-if 4462  df-sn 4563  df-pr 4565  df-op 4569  df-br 5080  df-opab 5142  df-id 5520  df-xp 5631  df-rel 5632  df-cnv 5633  df-co 5634  df-dm 5635  df-rn 5636  df-fun 6494  df-fn 6495  df-f 6496  df-f1 6497

This theorem is referenced by:  umgr0e  29204  usgr0e  29330