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Theorem f10d 6851
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
StepHypRef Expression
1 f10 6850 . . 3 ∅:∅–1-1→𝐴
2 dm0 5902 . . . 4 dom ∅ = ∅
3 f1eq2 6766 . . . 4 (dom ∅ = ∅ → (∅:dom ∅–1-1→𝐴 ↔ ∅:∅–1-1→𝐴))
42, 3ax-mp 5 . . 3 (∅:dom ∅–1-1→𝐴 ↔ ∅:∅–1-1→𝐴)
51, 4mpbir 234 . 2 ∅:dom ∅–1-1→𝐴
6 f10d.f . . 3 (𝜑 → 𝐹 = ∅)
76dmeqd 5887 . . 3 (𝜑 → dom 𝐹 = dom ∅)
8 eqidd 2762 . . 3 (𝜑 → 𝐴 = 𝐴)
96, 7, 8f1eq123d 6808 . 2 (𝜑 → (𝐹:dom 𝐹–1-1→𝐴 ↔ ∅:dom ∅–1-1→𝐴))
105, 9mpbiri 261 1 (𝜑 → 𝐹:dom 𝐹–1-1→𝐴)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:   → wi 4   ↔ wb 209   = wceq 1570  ∅c0 4279  dom cdm 5651  –1-1→wf1 6528
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1828  ax-4 1842  ax-5 1943  ax-6 2000  ax-7 2041  ax-8 2147  ax-9 2155  ax-ext 2733  ax-sep 5249  ax-nul 5260  ax-pr 5391
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1573  df-fal 1583  df-ex 1813  df-sb 2100  df-mo 2565  df-clab 2740  df-cleq 2753  df-clel 2836  df-ral 3078  df-rex 3088  df-rab 3414  df-v 3453  df-dif 3902  df-un 3904  df-in 3906  df-ss 3916  df-nul 4280  df-if 4483  df-sn 4585  df-pr 4587  df-op 4591  df-br 5104  df-opab 5168  df-id 5546  df-xp 5657  df-rel 5658  df-cnv 5659  df-co 5660  df-dm 5661  df-rn 5662  df-fun 6533  df-fn 6534  df-f 6535  df-f1 6536
This theorem is used by:  umgr0e  29670  usgr0e  29799
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