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Theorem fv1stcnv 32016
Description: The value of the converse of 1st restricted to a singleton. (Contributed by Scott Fenton, 2-Jul-2020.)
Assertion
Ref Expression
fv1stcnv ((𝑋𝐴𝑌𝑉) → ((1st ↾ (𝐴 × {𝑌}))‘𝑋) = ⟨𝑋, 𝑌⟩)

Proof of Theorem fv1stcnv
StepHypRef Expression
1 snidg 4345 . . . . 5 (𝑌𝑉𝑌 ∈ {𝑌})
21anim2i 603 . . . 4 ((𝑋𝐴𝑌𝑉) → (𝑋𝐴𝑌 ∈ {𝑌}))
3 eqid 2771 . . . 4 𝑋 = 𝑋
42, 3jctil 509 . . 3 ((𝑋𝐴𝑌𝑉) → (𝑋 = 𝑋 ∧ (𝑋𝐴𝑌 ∈ {𝑌})))
5 opex 5060 . . . . . . 7 𝑋, 𝑌⟩ ∈ V
6 brcnvg 5441 . . . . . . 7 ((𝑋𝐴 ∧ ⟨𝑋, 𝑌⟩ ∈ V) → (𝑋(1st ↾ (𝐴 × {𝑌}))⟨𝑋, 𝑌⟩ ↔ ⟨𝑋, 𝑌⟩(1st ↾ (𝐴 × {𝑌}))𝑋))
75, 6mpan2 671 . . . . . 6 (𝑋𝐴 → (𝑋(1st ↾ (𝐴 × {𝑌}))⟨𝑋, 𝑌⟩ ↔ ⟨𝑋, 𝑌⟩(1st ↾ (𝐴 × {𝑌}))𝑋))
8 brresg 5541 . . . . . 6 (𝑋𝐴 → (⟨𝑋, 𝑌⟩(1st ↾ (𝐴 × {𝑌}))𝑋 ↔ (⟨𝑋, 𝑌⟩1st 𝑋 ∧ ⟨𝑋, 𝑌⟩ ∈ (𝐴 × {𝑌}))))
97, 8bitrd 268 . . . . 5 (𝑋𝐴 → (𝑋(1st ↾ (𝐴 × {𝑌}))⟨𝑋, 𝑌⟩ ↔ (⟨𝑋, 𝑌⟩1st 𝑋 ∧ ⟨𝑋, 𝑌⟩ ∈ (𝐴 × {𝑌}))))
109adantr 466 . . . 4 ((𝑋𝐴𝑌𝑉) → (𝑋(1st ↾ (𝐴 × {𝑌}))⟨𝑋, 𝑌⟩ ↔ (⟨𝑋, 𝑌⟩1st 𝑋 ∧ ⟨𝑋, 𝑌⟩ ∈ (𝐴 × {𝑌}))))
11 opelxp 5286 . . . . . 6 (⟨𝑋, 𝑌⟩ ∈ (𝐴 × {𝑌}) ↔ (𝑋𝐴𝑌 ∈ {𝑌}))
1211anbi2i 609 . . . . 5 ((⟨𝑋, 𝑌⟩1st 𝑋 ∧ ⟨𝑋, 𝑌⟩ ∈ (𝐴 × {𝑌})) ↔ (⟨𝑋, 𝑌⟩1st 𝑋 ∧ (𝑋𝐴𝑌 ∈ {𝑌})))
13 br1steqg 7337 . . . . . 6 ((𝑋𝐴𝑌𝑉) → (⟨𝑋, 𝑌⟩1st 𝑋𝑋 = 𝑋))
1413anbi1d 615 . . . . 5 ((𝑋𝐴𝑌𝑉) → ((⟨𝑋, 𝑌⟩1st 𝑋 ∧ (𝑋𝐴𝑌 ∈ {𝑌})) ↔ (𝑋 = 𝑋 ∧ (𝑋𝐴𝑌 ∈ {𝑌}))))
1512, 14syl5bb 272 . . . 4 ((𝑋𝐴𝑌𝑉) → ((⟨𝑋, 𝑌⟩1st 𝑋 ∧ ⟨𝑋, 𝑌⟩ ∈ (𝐴 × {𝑌})) ↔ (𝑋 = 𝑋 ∧ (𝑋𝐴𝑌 ∈ {𝑌}))))
1610, 15bitrd 268 . . 3 ((𝑋𝐴𝑌𝑉) → (𝑋(1st ↾ (𝐴 × {𝑌}))⟨𝑋, 𝑌⟩ ↔ (𝑋 = 𝑋 ∧ (𝑋𝐴𝑌 ∈ {𝑌}))))
174, 16mpbird 247 . 2 ((𝑋𝐴𝑌𝑉) → 𝑋(1st ↾ (𝐴 × {𝑌}))⟨𝑋, 𝑌⟩)
18 1stconst 7416 . . . 4 (𝑌𝑉 → (1st ↾ (𝐴 × {𝑌})):(𝐴 × {𝑌})–1-1-onto𝐴)
19 f1ocnv 6290 . . . 4 ((1st ↾ (𝐴 × {𝑌})):(𝐴 × {𝑌})–1-1-onto𝐴(1st ↾ (𝐴 × {𝑌})):𝐴1-1-onto→(𝐴 × {𝑌}))
20 f1ofn 6279 . . . 4 ((1st ↾ (𝐴 × {𝑌})):𝐴1-1-onto→(𝐴 × {𝑌}) → (1st ↾ (𝐴 × {𝑌})) Fn 𝐴)
2118, 19, 203syl 18 . . 3 (𝑌𝑉(1st ↾ (𝐴 × {𝑌})) Fn 𝐴)
22 simpl 468 . . 3 ((𝑋𝐴𝑌𝑉) → 𝑋𝐴)
23 fnbrfvb 6377 . . 3 (((1st ↾ (𝐴 × {𝑌})) Fn 𝐴𝑋𝐴) → (((1st ↾ (𝐴 × {𝑌}))‘𝑋) = ⟨𝑋, 𝑌⟩ ↔ 𝑋(1st ↾ (𝐴 × {𝑌}))⟨𝑋, 𝑌⟩))
2421, 22, 23syl2an2 666 . 2 ((𝑋𝐴𝑌𝑉) → (((1st ↾ (𝐴 × {𝑌}))‘𝑋) = ⟨𝑋, 𝑌⟩ ↔ 𝑋(1st ↾ (𝐴 × {𝑌}))⟨𝑋, 𝑌⟩))
2517, 24mpbird 247 1 ((𝑋𝐴𝑌𝑉) → ((1st ↾ (𝐴 × {𝑌}))‘𝑋) = ⟨𝑋, 𝑌⟩)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 196  wa 382   = wceq 1631  wcel 2145  Vcvv 3351  {csn 4316  cop 4322   class class class wbr 4786   × cxp 5247  ccnv 5248  cres 5251   Fn wfn 6026  1-1-ontowf1o 6030  cfv 6031  1st c1st 7313
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1870  ax-4 1885  ax-5 1991  ax-6 2057  ax-7 2093  ax-8 2147  ax-9 2154  ax-10 2174  ax-11 2190  ax-12 2203  ax-13 2408  ax-ext 2751  ax-sep 4915  ax-nul 4923  ax-pow 4974  ax-pr 5034  ax-un 7096
This theorem depends on definitions:  df-bi 197  df-an 383  df-or 835  df-3an 1073  df-tru 1634  df-ex 1853  df-nf 1858  df-sb 2050  df-eu 2622  df-mo 2623  df-clab 2758  df-cleq 2764  df-clel 2767  df-nfc 2902  df-ne 2944  df-ral 3066  df-rex 3067  df-rab 3070  df-v 3353  df-sbc 3588  df-csb 3683  df-dif 3726  df-un 3728  df-in 3730  df-ss 3737  df-nul 4064  df-if 4226  df-sn 4317  df-pr 4319  df-op 4323  df-uni 4575  df-iun 4656  df-br 4787  df-opab 4847  df-mpt 4864  df-id 5157  df-xp 5255  df-rel 5256  df-cnv 5257  df-co 5258  df-dm 5259  df-rn 5260  df-res 5261  df-ima 5262  df-iota 5994  df-fun 6033  df-fn 6034  df-f 6035  df-f1 6036  df-fo 6037  df-f1o 6038  df-fv 6039  df-1st 7315  df-2nd 7316
This theorem is referenced by: (None)
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