Theorem xpimasn 5211

Description: The image of a singleton by a cross product. (Contributed by Thierry Arnoux, 14-Jan-2018.)

Assertion

Ref	Expression
xpimasn	⊢ (𝑋 ∈ 𝐴 → ((𝐴 × 𝐵) “ {𝑋}) = 𝐵)

Proof of Theorem xpimasn

Dummy variable 𝑥 is distinct from all other variables.

Step	Hyp	Ref	Expression
1		snmg 3810	. . 3 ⊢ (𝑋 ∈ 𝐴 → ∃𝑥 𝑥 ∈ {𝑋})
2		snssi 3838	. . . . . 6 ⊢ (𝑋 ∈ 𝐴 → {𝑋} ⊆ 𝐴)
3		dfss1 3425	. . . . . 6 ⊢ ({𝑋} ⊆ 𝐴 ↔ (𝐴 ∩ {𝑋}) = {𝑋})
4	2, 3	sylib 122	. . . . 5 ⊢ (𝑋 ∈ 𝐴 → (𝐴 ∩ {𝑋}) = {𝑋})
5	4	eleq2d 2302	. . . 4 ⊢ (𝑋 ∈ 𝐴 → (𝑥 ∈ (𝐴 ∩ {𝑋}) ↔ 𝑥 ∈ {𝑋}))
6	5	exbidv 1874	. . 3 ⊢ (𝑋 ∈ 𝐴 → (∃𝑥 𝑥 ∈ (𝐴 ∩ {𝑋}) ↔ ∃𝑥 𝑥 ∈ {𝑋}))
7	1, 6	mpbird 167	. 2 ⊢ (𝑋 ∈ 𝐴 → ∃𝑥 𝑥 ∈ (𝐴 ∩ {𝑋}))
8		xpima2m 5210	. 2 ⊢ (∃𝑥 𝑥 ∈ (𝐴 ∩ {𝑋}) → ((𝐴 × 𝐵) “ {𝑋}) = 𝐵)
9	7, 8	syl 14	1 ⊢ (𝑋 ∈ 𝐴 → ((𝐴 × 𝐵) “ {𝑋}) = 𝐵)

Syntax hints:   → wi 4   = wceq 1398  ∃wex 1541   ∈ wcel 2203   ∩ cin 3210   ⊆ wss 3211  {csn 3689   × cxp 4747   “ cima 4752

This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-ia1 106  ax-ia2 107  ax-ia3 108  ax-io 717  ax-5 1496  ax-7 1497  ax-gen 1498  ax-ie1 1542  ax-ie2 1543  ax-8 1553  ax-10 1554  ax-11 1555  ax-i12 1556  ax-bndl 1558  ax-4 1559  ax-17 1575  ax-i9 1579  ax-ial 1583  ax-i5r 1584  ax-14 2206  ax-ext 2214  ax-sep 4228  ax-pow 4287  ax-pr 4322

This theorem depends on definitions:  df-bi 117  df-3an 1007  df-tru 1401  df-nf 1510  df-sb 1812  df-eu 2083  df-mo 2084  df-clab 2219  df-cleq 2225  df-clel 2228  df-nfc 2373  df-ral 2525  df-rex 2526  df-v 2815  df-un 3215  df-in 3217  df-ss 3224  df-pw 3671  df-sn 3695  df-pr 3696  df-op 3698  df-br 4110  df-opab 4172  df-xp 4755  df-rel 4756  df-cnv 4757  df-dm 4759  df-rn 4760  df-res 4761  df-ima 4762

This theorem is referenced by:  imasnopn  15164