Theorem elimasni 6050

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

Step	Hyp	Ref	Expression
1		noel 4269	. . . . 5 ⊢ ¬ 𝐶 ∈ ∅
2		snprc 4652	. . . . . . . . 9 ⊢ (¬ 𝐵 ∈ V ↔ {𝐵} = ∅)
3	2	biimpi 218	. . . . . . . 8 ⊢ (¬ 𝐵 ∈ V → {𝐵} = ∅)
4	3	imaeq2d 6019	. . . . . . 7 ⊢ (¬ 𝐵 ∈ V → (𝐴 “ {𝐵}) = (𝐴 “ ∅))
5		ima0 6036	. . . . . . 7 ⊢ (𝐴 “ ∅) = ∅
6	4, 5	eqtrdi 2792	. . . . . 6 ⊢ (¬ 𝐵 ∈ V → (𝐴 “ {𝐵}) = ∅)
7	6	eleq2d 2827	. . . . 5 ⊢ (¬ 𝐵 ∈ V → (𝐶 ∈ (𝐴 “ {𝐵}) ↔ 𝐶 ∈ ∅))
8	1, 7	mtbiri 329	. . . 4 ⊢ (¬ 𝐵 ∈ V → ¬ 𝐶 ∈ (𝐴 “ {𝐵}))
9	8	con4i 114	. . 3 ⊢ (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐵 ∈ V)
10		elex 3454	. . 3 ⊢ (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐶 ∈ V)
11	9, 10	jca 517	. 2 ⊢ (𝐶 ∈ (𝐴 “ {𝐵}) → (𝐵 ∈ V ∧ 𝐶 ∈ V))
12		elimasng1 6046	. . 3 ⊢ ((𝐵 ∈ V ∧ 𝐶 ∈ V) → (𝐶 ∈ (𝐴 “ {𝐵}) ↔ 𝐵𝐴𝐶))
13	12	biimpd 231	. 2 ⊢ ((𝐵 ∈ V ∧ 𝐶 ∈ V) → (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐵𝐴𝐶))
14	11, 13	mpcom 38	1 ⊢ (𝐶 ∈ (𝐴 “ {𝐵}) → 𝐵𝐴𝐶)

Syntax hints:  ¬ wn 3   → wi 4   ∧ wa 397   = wceq 1548   ∈ wcel 2121  Vcvv 3433  ∅c0 4264  {csn 4558   class class class wbr 5075   “ cima 5624

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1803  ax-4 1817  ax-5 1918  ax-6 1975  ax-7 2016  ax-8 2123  ax-9 2131  ax-ext 2713  ax-sep 5221  ax-pr 5365

This theorem depends on definitions:  df-bi 209  df-an 398  df-or 855  df-3an 1095  df-tru 1551  df-fal 1561  df-ex 1788  df-sb 2075  df-clab 2720  df-cleq 2733  df-clel 2816  df-ral 3056  df-rex 3066  df-rab 3394  df-v 3435  df-dif 3888  df-un 3890  df-in 3892  df-ss 3902  df-nul 4265  df-if 4458  df-sn 4559  df-pr 4561  df-op 4565  df-br 5076  df-opab 5138  df-xp 5627  df-cnv 5629  df-dm 5631  df-rn 5632  df-res 5633  df-ima 5634

This theorem is referenced by:  dffv2  6926  poimirlem2  38004  poimirlem23  38025