Users' Mathboxes Mathbox for Scott Fenton < Previous   Next >
Nearby theorems
Mirrors  >  Home  >  MPE Home  >  Th. List  >   Mathboxes  >  fv2ndcnv Structured version   Visualization version   GIF version

Theorem fv2ndcnv 33339
Description: The value of the converse of 2nd restricted to a singleton. (Contributed by Scott Fenton, 2-Jul-2020.)
Assertion
Ref Expression
fv2ndcnv ((𝑋𝑉𝑌𝐴) → ((2nd ↾ ({𝑋} × 𝐴))‘𝑌) = ⟨𝑋, 𝑌⟩)

Proof of Theorem fv2ndcnv
StepHypRef Expression
1 snidg 4560 . . . 4 (𝑋𝑉𝑋 ∈ {𝑋})
21anim1i 618 . . 3 ((𝑋𝑉𝑌𝐴) → (𝑋 ∈ {𝑋} ∧ 𝑌𝐴))
3 eqid 2739 . . 3 𝑌 = 𝑌
42, 3jctir 524 . 2 ((𝑋𝑉𝑌𝐴) → ((𝑋 ∈ {𝑋} ∧ 𝑌𝐴) ∧ 𝑌 = 𝑌))
5 2ndconst 7835 . . . . . 6 (𝑋𝑉 → (2nd ↾ ({𝑋} × 𝐴)):({𝑋} × 𝐴)–1-1-onto𝐴)
65adantr 484 . . . . 5 ((𝑋𝑉𝑌𝐴) → (2nd ↾ ({𝑋} × 𝐴)):({𝑋} × 𝐴)–1-1-onto𝐴)
7 f1ocnv 6643 . . . . 5 ((2nd ↾ ({𝑋} × 𝐴)):({𝑋} × 𝐴)–1-1-onto𝐴(2nd ↾ ({𝑋} × 𝐴)):𝐴1-1-onto→({𝑋} × 𝐴))
8 f1ofn 6632 . . . . 5 ((2nd ↾ ({𝑋} × 𝐴)):𝐴1-1-onto→({𝑋} × 𝐴) → (2nd ↾ ({𝑋} × 𝐴)) Fn 𝐴)
96, 7, 83syl 18 . . . 4 ((𝑋𝑉𝑌𝐴) → (2nd ↾ ({𝑋} × 𝐴)) Fn 𝐴)
10 fnbrfvb 6735 . . . 4 (((2nd ↾ ({𝑋} × 𝐴)) Fn 𝐴𝑌𝐴) → (((2nd ↾ ({𝑋} × 𝐴))‘𝑌) = ⟨𝑋, 𝑌⟩ ↔ 𝑌(2nd ↾ ({𝑋} × 𝐴))⟨𝑋, 𝑌⟩))
119, 10sylancom 591 . . 3 ((𝑋𝑉𝑌𝐴) → (((2nd ↾ ({𝑋} × 𝐴))‘𝑌) = ⟨𝑋, 𝑌⟩ ↔ 𝑌(2nd ↾ ({𝑋} × 𝐴))⟨𝑋, 𝑌⟩))
12 opex 5332 . . . . . 6 𝑋, 𝑌⟩ ∈ V
13 brcnvg 5732 . . . . . 6 ((𝑌𝐴 ∧ ⟨𝑋, 𝑌⟩ ∈ V) → (𝑌(2nd ↾ ({𝑋} × 𝐴))⟨𝑋, 𝑌⟩ ↔ ⟨𝑋, 𝑌⟩(2nd ↾ ({𝑋} × 𝐴))𝑌))
1412, 13mpan2 691 . . . . 5 (𝑌𝐴 → (𝑌(2nd ↾ ({𝑋} × 𝐴))⟨𝑋, 𝑌⟩ ↔ ⟨𝑋, 𝑌⟩(2nd ↾ ({𝑋} × 𝐴))𝑌))
1514adantl 485 . . . 4 ((𝑋𝑉𝑌𝐴) → (𝑌(2nd ↾ ({𝑋} × 𝐴))⟨𝑋, 𝑌⟩ ↔ ⟨𝑋, 𝑌⟩(2nd ↾ ({𝑋} × 𝐴))𝑌))
16 brres 5842 . . . . . 6 (𝑌𝐴 → (⟨𝑋, 𝑌⟩(2nd ↾ ({𝑋} × 𝐴))𝑌 ↔ (⟨𝑋, 𝑌⟩ ∈ ({𝑋} × 𝐴) ∧ ⟨𝑋, 𝑌⟩2nd 𝑌)))
1716adantl 485 . . . . 5 ((𝑋𝑉𝑌𝐴) → (⟨𝑋, 𝑌⟩(2nd ↾ ({𝑋} × 𝐴))𝑌 ↔ (⟨𝑋, 𝑌⟩ ∈ ({𝑋} × 𝐴) ∧ ⟨𝑋, 𝑌⟩2nd 𝑌)))
18 opelxp 5571 . . . . . . 7 (⟨𝑋, 𝑌⟩ ∈ ({𝑋} × 𝐴) ↔ (𝑋 ∈ {𝑋} ∧ 𝑌𝐴))
1918anbi1i 627 . . . . . 6 ((⟨𝑋, 𝑌⟩ ∈ ({𝑋} × 𝐴) ∧ ⟨𝑋, 𝑌⟩2nd 𝑌) ↔ ((𝑋 ∈ {𝑋} ∧ 𝑌𝐴) ∧ ⟨𝑋, 𝑌⟩2nd 𝑌))
20 br2ndeqg 7750 . . . . . . 7 ((𝑋𝑉𝑌𝐴) → (⟨𝑋, 𝑌⟩2nd 𝑌𝑌 = 𝑌))
2120anbi2d 632 . . . . . 6 ((𝑋𝑉𝑌𝐴) → (((𝑋 ∈ {𝑋} ∧ 𝑌𝐴) ∧ ⟨𝑋, 𝑌⟩2nd 𝑌) ↔ ((𝑋 ∈ {𝑋} ∧ 𝑌𝐴) ∧ 𝑌 = 𝑌)))
2219, 21syl5bb 286 . . . . 5 ((𝑋𝑉𝑌𝐴) → ((⟨𝑋, 𝑌⟩ ∈ ({𝑋} × 𝐴) ∧ ⟨𝑋, 𝑌⟩2nd 𝑌) ↔ ((𝑋 ∈ {𝑋} ∧ 𝑌𝐴) ∧ 𝑌 = 𝑌)))
2317, 22bitrd 282 . . . 4 ((𝑋𝑉𝑌𝐴) → (⟨𝑋, 𝑌⟩(2nd ↾ ({𝑋} × 𝐴))𝑌 ↔ ((𝑋 ∈ {𝑋} ∧ 𝑌𝐴) ∧ 𝑌 = 𝑌)))
2415, 23bitrd 282 . . 3 ((𝑋𝑉𝑌𝐴) → (𝑌(2nd ↾ ({𝑋} × 𝐴))⟨𝑋, 𝑌⟩ ↔ ((𝑋 ∈ {𝑋} ∧ 𝑌𝐴) ∧ 𝑌 = 𝑌)))
2511, 24bitrd 282 . 2 ((𝑋𝑉𝑌𝐴) → (((2nd ↾ ({𝑋} × 𝐴))‘𝑌) = ⟨𝑋, 𝑌⟩ ↔ ((𝑋 ∈ {𝑋} ∧ 𝑌𝐴) ∧ 𝑌 = 𝑌)))
264, 25mpbird 260 1 ((𝑋𝑉𝑌𝐴) → ((2nd ↾ ({𝑋} × 𝐴))‘𝑌) = ⟨𝑋, 𝑌⟩)
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 209  wa 399   = wceq 1542  wcel 2114  Vcvv 3400  {csn 4526  cop 4532   class class class wbr 5040   × cxp 5533  ccnv 5534  cres 5537   Fn wfn 6345  1-1-ontowf1o 6349  cfv 6350  2nd c2nd 7726
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1802  ax-4 1816  ax-5 1917  ax-6 1975  ax-7 2020  ax-8 2116  ax-9 2124  ax-10 2145  ax-11 2162  ax-12 2179  ax-ext 2711  ax-sep 5177  ax-nul 5184  ax-pr 5306  ax-un 7492
This theorem depends on definitions:  df-bi 210  df-an 400  df-or 847  df-3an 1090  df-tru 1545  df-fal 1555  df-ex 1787  df-nf 1791  df-sb 2075  df-mo 2541  df-eu 2571  df-clab 2718  df-cleq 2731  df-clel 2812  df-nfc 2882  df-ne 2936  df-ral 3059  df-rex 3060  df-rab 3063  df-v 3402  df-sbc 3686  df-csb 3801  df-dif 3856  df-un 3858  df-in 3860  df-ss 3870  df-nul 4222  df-if 4425  df-sn 4527  df-pr 4529  df-op 4533  df-uni 4807  df-iun 4893  df-br 5041  df-opab 5103  df-mpt 5121  df-id 5439  df-xp 5541  df-rel 5542  df-cnv 5543  df-co 5544  df-dm 5545  df-rn 5546  df-res 5547  df-ima 5548  df-iota 6308  df-fun 6352  df-fn 6353  df-f 6354  df-f1 6355  df-fo 6356  df-f1o 6357  df-fv 6358  df-1st 7727  df-2nd 7728
This theorem is referenced by: (None)
  Copyright terms: Public domain W3C validator