Theorem xpimasn 5130

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 3750	. . 3 ⊢ (𝑋 ∈ 𝐴 → ∃𝑥 𝑥 ∈ {𝑋})
2		snssi 3776	. . . . . 6 ⊢ (𝑋 ∈ 𝐴 → {𝑋} ⊆ 𝐴)
3		dfss1 3376	. . . . . 6 ⊢ ({𝑋} ⊆ 𝐴 ↔ (𝐴 ∩ {𝑋}) = {𝑋})
4	2, 3	sylib 122	. . . . 5 ⊢ (𝑋 ∈ 𝐴 → (𝐴 ∩ {𝑋}) = {𝑋})
5	4	eleq2d 2274	. . . 4 ⊢ (𝑋 ∈ 𝐴 → (𝑥 ∈ (𝐴 ∩ {𝑋}) ↔ 𝑥 ∈ {𝑋}))
6	5	exbidv 1847	. . 3 ⊢ (𝑋 ∈ 𝐴 → (∃𝑥 𝑥 ∈ (𝐴 ∩ {𝑋}) ↔ ∃𝑥 𝑥 ∈ {𝑋}))
7	1, 6	mpbird 167	. 2 ⊢ (𝑋 ∈ 𝐴 → ∃𝑥 𝑥 ∈ (𝐴 ∩ {𝑋}))
8		xpima2m 5129	. 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 1372  ∃wex 1514   ∈ wcel 2175   ∩ cin 3164   ⊆ wss 3165  {csn 3632   × cxp 4672   “ cima 4677

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 710  ax-5 1469  ax-7 1470  ax-gen 1471  ax-ie1 1515  ax-ie2 1516  ax-8 1526  ax-10 1527  ax-11 1528  ax-i12 1529  ax-bndl 1531  ax-4 1532  ax-17 1548  ax-i9 1552  ax-ial 1556  ax-i5r 1557  ax-14 2178  ax-ext 2186  ax-sep 4161  ax-pow 4217  ax-pr 4252

This theorem depends on definitions:  df-bi 117  df-3an 982  df-tru 1375  df-nf 1483  df-sb 1785  df-eu 2056  df-mo 2057  df-clab 2191  df-cleq 2197  df-clel 2200  df-nfc 2336  df-ral 2488  df-rex 2489  df-v 2773  df-un 3169  df-in 3171  df-ss 3178  df-pw 3617  df-sn 3638  df-pr 3639  df-op 3641  df-br 4044  df-opab 4105  df-xp 4680  df-rel 4681  df-cnv 4682  df-dm 4684  df-rn 4685  df-res 4686  df-ima 4687

This theorem is referenced by:  imasnopn  14713