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Theorem fmptsng 6316
Description: Express a singleton function in maps-to notation. Version of fmptsn 6315 allowing the mapping value to depend on the mapping variable (usual case). (Contributed by AV, 27-Feb-2019.)
Hypothesis
Ref Expression
fmptsng.1 (𝑥 = 𝐴𝐵 = 𝐶)
Assertion
Ref Expression
fmptsng ((𝐴𝑉𝐶𝑊) → {⟨𝐴, 𝐶⟩} = (𝑥 ∈ {𝐴} ↦ 𝐵))
Distinct variable groups:   𝑥,𝐴   𝑥,𝐶
Allowed substitution hints:   𝐵(𝑥)   𝑉(𝑥)   𝑊(𝑥)

Proof of Theorem fmptsng
Dummy variables 𝑝 𝑦 are mutually distinct and distinct from all other variables.
StepHypRef Expression
1 velsn 4140 . . . . 5 (𝑥 ∈ {𝐴} ↔ 𝑥 = 𝐴)
21bicomi 212 . . . 4 (𝑥 = 𝐴𝑥 ∈ {𝐴})
32anbi1i 726 . . 3 ((𝑥 = 𝐴𝑦 = 𝐵) ↔ (𝑥 ∈ {𝐴} ∧ 𝑦 = 𝐵))
43opabbii 4643 . 2 {⟨𝑥, 𝑦⟩ ∣ (𝑥 = 𝐴𝑦 = 𝐵)} = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ {𝐴} ∧ 𝑦 = 𝐵)}
5 velsn 4140 . . . . 5 (𝑝 ∈ {⟨𝐴, 𝐶⟩} ↔ 𝑝 = ⟨𝐴, 𝐶⟩)
6 eqidd 2610 . . . . . . 7 ((𝐴𝑉𝐶𝑊) → 𝐴 = 𝐴)
7 eqidd 2610 . . . . . . 7 ((𝐴𝑉𝐶𝑊) → 𝐶 = 𝐶)
8 eqeq1 2613 . . . . . . . . . 10 (𝑥 = 𝐴 → (𝑥 = 𝐴𝐴 = 𝐴))
98adantr 479 . . . . . . . . 9 ((𝑥 = 𝐴𝑦 = 𝐶) → (𝑥 = 𝐴𝐴 = 𝐴))
10 eqeq1 2613 . . . . . . . . . 10 (𝑦 = 𝐶 → (𝑦 = 𝐵𝐶 = 𝐵))
11 fmptsng.1 . . . . . . . . . . 11 (𝑥 = 𝐴𝐵 = 𝐶)
1211eqeq2d 2619 . . . . . . . . . 10 (𝑥 = 𝐴 → (𝐶 = 𝐵𝐶 = 𝐶))
1310, 12sylan9bbr 732 . . . . . . . . 9 ((𝑥 = 𝐴𝑦 = 𝐶) → (𝑦 = 𝐵𝐶 = 𝐶))
149, 13anbi12d 742 . . . . . . . 8 ((𝑥 = 𝐴𝑦 = 𝐶) → ((𝑥 = 𝐴𝑦 = 𝐵) ↔ (𝐴 = 𝐴𝐶 = 𝐶)))
1514opelopabga 4902 . . . . . . 7 ((𝐴𝑉𝐶𝑊) → (⟨𝐴, 𝐶⟩ ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 = 𝐴𝑦 = 𝐵)} ↔ (𝐴 = 𝐴𝐶 = 𝐶)))
166, 7, 15mpbir2and 958 . . . . . 6 ((𝐴𝑉𝐶𝑊) → ⟨𝐴, 𝐶⟩ ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 = 𝐴𝑦 = 𝐵)})
17 eleq1 2675 . . . . . 6 (𝑝 = ⟨𝐴, 𝐶⟩ → (𝑝 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 = 𝐴𝑦 = 𝐵)} ↔ ⟨𝐴, 𝐶⟩ ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 = 𝐴𝑦 = 𝐵)}))
1816, 17syl5ibrcom 235 . . . . 5 ((𝐴𝑉𝐶𝑊) → (𝑝 = ⟨𝐴, 𝐶⟩ → 𝑝 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 = 𝐴𝑦 = 𝐵)}))
195, 18syl5bi 230 . . . 4 ((𝐴𝑉𝐶𝑊) → (𝑝 ∈ {⟨𝐴, 𝐶⟩} → 𝑝 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 = 𝐴𝑦 = 𝐵)}))
20 elopab 4897 . . . . 5 (𝑝 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 = 𝐴𝑦 = 𝐵)} ↔ ∃𝑥𝑦(𝑝 = ⟨𝑥, 𝑦⟩ ∧ (𝑥 = 𝐴𝑦 = 𝐵)))
21 opeq12 4336 . . . . . . . . . 10 ((𝑥 = 𝐴𝑦 = 𝐵) → ⟨𝑥, 𝑦⟩ = ⟨𝐴, 𝐵⟩)
2221eqeq2d 2619 . . . . . . . . 9 ((𝑥 = 𝐴𝑦 = 𝐵) → (𝑝 = ⟨𝑥, 𝑦⟩ ↔ 𝑝 = ⟨𝐴, 𝐵⟩))
2311adantr 479 . . . . . . . . . . . 12 ((𝑥 = 𝐴𝑦 = 𝐵) → 𝐵 = 𝐶)
2423opeq2d 4341 . . . . . . . . . . 11 ((𝑥 = 𝐴𝑦 = 𝐵) → ⟨𝐴, 𝐵⟩ = ⟨𝐴, 𝐶⟩)
25 opex 4852 . . . . . . . . . . . 12 𝐴, 𝐶⟩ ∈ V
2625snid 4154 . . . . . . . . . . 11 𝐴, 𝐶⟩ ∈ {⟨𝐴, 𝐶⟩}
2724, 26syl6eqel 2695 . . . . . . . . . 10 ((𝑥 = 𝐴𝑦 = 𝐵) → ⟨𝐴, 𝐵⟩ ∈ {⟨𝐴, 𝐶⟩})
28 eleq1 2675 . . . . . . . . . 10 (𝑝 = ⟨𝐴, 𝐵⟩ → (𝑝 ∈ {⟨𝐴, 𝐶⟩} ↔ ⟨𝐴, 𝐵⟩ ∈ {⟨𝐴, 𝐶⟩}))
2927, 28syl5ibrcom 235 . . . . . . . . 9 ((𝑥 = 𝐴𝑦 = 𝐵) → (𝑝 = ⟨𝐴, 𝐵⟩ → 𝑝 ∈ {⟨𝐴, 𝐶⟩}))
3022, 29sylbid 228 . . . . . . . 8 ((𝑥 = 𝐴𝑦 = 𝐵) → (𝑝 = ⟨𝑥, 𝑦⟩ → 𝑝 ∈ {⟨𝐴, 𝐶⟩}))
3130impcom 444 . . . . . . 7 ((𝑝 = ⟨𝑥, 𝑦⟩ ∧ (𝑥 = 𝐴𝑦 = 𝐵)) → 𝑝 ∈ {⟨𝐴, 𝐶⟩})
3231exlimivv 1846 . . . . . 6 (∃𝑥𝑦(𝑝 = ⟨𝑥, 𝑦⟩ ∧ (𝑥 = 𝐴𝑦 = 𝐵)) → 𝑝 ∈ {⟨𝐴, 𝐶⟩})
3332a1i 11 . . . . 5 ((𝐴𝑉𝐶𝑊) → (∃𝑥𝑦(𝑝 = ⟨𝑥, 𝑦⟩ ∧ (𝑥 = 𝐴𝑦 = 𝐵)) → 𝑝 ∈ {⟨𝐴, 𝐶⟩}))
3420, 33syl5bi 230 . . . 4 ((𝐴𝑉𝐶𝑊) → (𝑝 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 = 𝐴𝑦 = 𝐵)} → 𝑝 ∈ {⟨𝐴, 𝐶⟩}))
3519, 34impbid 200 . . 3 ((𝐴𝑉𝐶𝑊) → (𝑝 ∈ {⟨𝐴, 𝐶⟩} ↔ 𝑝 ∈ {⟨𝑥, 𝑦⟩ ∣ (𝑥 = 𝐴𝑦 = 𝐵)}))
3635eqrdv 2607 . 2 ((𝐴𝑉𝐶𝑊) → {⟨𝐴, 𝐶⟩} = {⟨𝑥, 𝑦⟩ ∣ (𝑥 = 𝐴𝑦 = 𝐵)})
37 df-mpt 4639 . . 3 (𝑥 ∈ {𝐴} ↦ 𝐵) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ {𝐴} ∧ 𝑦 = 𝐵)}
3837a1i 11 . 2 ((𝐴𝑉𝐶𝑊) → (𝑥 ∈ {𝐴} ↦ 𝐵) = {⟨𝑥, 𝑦⟩ ∣ (𝑥 ∈ {𝐴} ∧ 𝑦 = 𝐵)})
394, 36, 383eqtr4a 2669 1 ((𝐴𝑉𝐶𝑊) → {⟨𝐴, 𝐶⟩} = (𝑥 ∈ {𝐴} ↦ 𝐵))
Colors of variables: wff setvar class
Syntax hints:  wi 4  wb 194  wa 382   = wceq 1474  wex 1694  wcel 1976  {csn 4124  cop 4130  {copab 4636  cmpt 4637
This theorem was proved from axioms:  ax-mp 5  ax-1 6  ax-2 7  ax-3 8  ax-gen 1712  ax-4 1727  ax-5 1826  ax-6 1874  ax-7 1921  ax-9 1985  ax-10 2005  ax-11 2020  ax-12 2033  ax-13 2233  ax-ext 2589  ax-sep 4703  ax-nul 4711  ax-pr 4827
This theorem depends on definitions:  df-bi 195  df-or 383  df-an 384  df-3an 1032  df-tru 1477  df-ex 1695  df-nf 1700  df-sb 1867  df-eu 2461  df-mo 2462  df-clab 2596  df-cleq 2602  df-clel 2605  df-nfc 2739  df-rab 2904  df-v 3174  df-dif 3542  df-un 3544  df-in 3546  df-ss 3553  df-nul 3874  df-if 4036  df-sn 4125  df-pr 4127  df-op 4131  df-opab 4638  df-mpt 4639
This theorem is referenced by:  mdet0pr  20164  m1detdiag  20169
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