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Theorem elimasni 6095
Description: Membership in an image of a singleton. (Contributed by NM, 5-Aug-2010.)
Assertion
Ref Expression
elimasni (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐵𝐴𝐶)

Proof of Theorem elimasni
StepHypRef Expression
1 noel 4286 . . . . 5 ¬ 𝐶 ∈ ∅
2 snprc 4678 . . . . . . . . 9 (¬ 𝐵 ∈ V ↔ {𝐵} = ∅)
32biimpi 219 . . . . . . . 8 (¬ 𝐵 ∈ V → {𝐵} = ∅)
43imaeq2d 6058 . . . . . . 7 (¬ 𝐵 ∈ V → (𝐴 “ {𝐵}) = (𝐴 “ ∅))
5 ima0 6081 . . . . . . 7 (𝐴 “ ∅) = ∅
64, 5eqtrdi 2814 . . . . . 6 (¬ 𝐵 ∈ V → (𝐴 “ {𝐵}) = ∅)
76eleq2d 2850 . . . . 5 (¬ 𝐵 ∈ V → (𝐶 ∈ (𝐴 “ {𝐵}) ↔ 𝐶 ∈ ∅))
81, 7mtbiri 330 . . . 4 (¬ 𝐵 ∈ V → ¬ 𝐶 ∈ (𝐴 “ {𝐵}))
98con4i 115 . . 3 (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐵 ∈ V)
10 elex 3475 . . 3 (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐶 ∈ V)
119, 10jca 521 . 2 (𝐶 ∈ (𝐴 “ {𝐵}) → (𝐵 ∈ V ∧ 𝐶 ∈ V))
12 elimasng1 6091 . . 3 ((𝐵 ∈ V ∧ 𝐶 ∈ V) → (𝐶 ∈ (𝐴 “ {𝐵}) ↔ 𝐵𝐴𝐶))
1312biimpd 232 . 2 ((𝐵 ∈ V ∧ 𝐶 ∈ V) → (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐵𝐴𝐶))
1411, 13mpcom 39 1 (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐵𝐴𝐶)
Colors of variables:    wff setvar class
This proof depends on syntax axioms:  ¬ wn 3   → wi 4   ∧ wa 401   = wceq 1569   ∈ wcel 2146  Vcvv 3454  ∅c0 4281  {csn 4588   class class class wbr 5106   “ cima 5658
This proof depends on axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1827  ax-4 1841  ax-5 1944  ax-6 2001  ax-7 2042  ax-8 2148  ax-9 2156  ax-ext 2735  ax-sep 5252  ax-pr 5395
This proof depends on definitions:  df-bi 210  df-an 402  df-or 862  df-3an 1105  df-tru 1572  df-fal 1582  df-ex 1812  df-sb 2101  df-clab 2742  df-cleq 2755  df-clel 2839  df-ral 3081  df-rex 3091  df-rab 3417  df-v 3456  df-ss 3901  df-dif 4050  df-in 4094  df-un 4154  df-nul 4282  df-if 4486  df-sn 4589  df-pr 4591  df-op 4839  df-br 5107  df-opab 5171  df-xp 5661  df-cnv 5663  df-dm 5665  df-rn 5666  df-res 5667  df-ima 5668
This theorem is used by:  dffv2  6991  poimirlem2  38683  poimirlem23  38704
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