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| Mirrors > Home > ILE Home > Th. List > snopfsuppdc | GIF version | ||
| Description: A singleton containing an ordered pair is a finitely supported function. (Contributed by AV, 19-Jul-2019.) |
| Ref | Expression |
|---|---|
| snopfsuppdc.x | ⊢ (𝜑 → 𝑋 ∈ 𝑉) |
| snopfsuppdc.y | ⊢ (𝜑 → 𝑌 ∈ 𝑊) |
| snopfsuppdc.z | ⊢ (𝜑 → 𝑍 ∈ 𝑈) |
| snopfsuppdc.dc | ⊢ (𝜑 → DECID 𝑌 = 𝑍) |
| Ref | Expression |
|---|---|
| snopfsuppdc | ⊢ (𝜑 → {〈𝑋, 𝑌〉} finSupp 𝑍) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | snopfsuppdc.x | . . . 4 ⊢ (𝜑 → 𝑋 ∈ 𝑉) | |
| 2 | snopfsuppdc.y | . . . 4 ⊢ (𝜑 → 𝑌 ∈ 𝑊) | |
| 3 | opexg 4363 | . . . 4 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑊) → 〈𝑋, 𝑌〉 ∈ V) | |
| 4 | 1, 2, 3 | syl2anc 415 | . . 3 ⊢ (𝜑 → 〈𝑋, 𝑌〉 ∈ V) |
| 5 | snexg 4316 | . . 3 ⊢ (〈𝑋, 𝑌〉 ∈ V → {〈𝑋, 𝑌〉} ∈ V) | |
| 6 | 4, 5 | syl 14 | . 2 ⊢ (𝜑 → {〈𝑋, 𝑌〉} ∈ V) |
| 7 | snopfsuppdc.z | . 2 ⊢ (𝜑 → 𝑍 ∈ 𝑈) | |
| 8 | funsng 5422 | . . 3 ⊢ ((𝑋 ∈ 𝑉 ∧ 𝑌 ∈ 𝑊) → Fun {〈𝑋, 𝑌〉}) | |
| 9 | 1, 2, 8 | syl2anc 415 | . 2 ⊢ (𝜑 → Fun {〈𝑋, 𝑌〉}) |
| 10 | eqid 2238 | . . . 4 ⊢ {〈𝑋, 𝑌〉} = {〈𝑋, 𝑌〉} | |
| 11 | snopfsuppdc.dc | . . . 4 ⊢ (𝜑 → DECID 𝑌 = 𝑍) | |
| 12 | 10, 1, 2, 7, 11 | suppsnopdc 6480 | . . 3 ⊢ (𝜑 → ({〈𝑋, 𝑌〉} supp 𝑍) = if(𝑌 = 𝑍, ∅, {𝑋})) |
| 13 | 0fi 7178 | . . . . 5 ⊢ ∅ ∈ Fin | |
| 14 | 13 | a1i 9 | . . . 4 ⊢ (𝜑 → ∅ ∈ Fin) |
| 15 | snfig 7093 | . . . . 5 ⊢ (𝑋 ∈ 𝑉 → {𝑋} ∈ Fin) | |
| 16 | 1, 15 | syl 14 | . . . 4 ⊢ (𝜑 → {𝑋} ∈ Fin) |
| 17 | 14, 16, 11 | ifcldcd 3675 | . . 3 ⊢ (𝜑 → if(𝑌 = 𝑍, ∅, {𝑋}) ∈ Fin) |
| 18 | 12, 17 | eqeltrd 2315 | . 2 ⊢ (𝜑 → ({〈𝑋, 𝑌〉} supp 𝑍) ∈ Fin) |
| 19 | 6, 7, 9, 18 | isfsuppd 7280 | 1 ⊢ (𝜑 → {〈𝑋, 𝑌〉} finSupp 𝑍) |
| Colors of variables: wff set class |
| Syntax hints: → wi 4 DECID wdc 846 = wceq 1402 ∈ wcel 2209 Vcvv 2821 ∅c0 3520 ifcif 3635 {csn 3705 〈cop 3708 class class class wbr 4125 Fun wfun 5366 (class class class)co 6075 supp csupp 6465 Fincfn 7012 finSupp cfsupp 7275 |
| 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-in1 623 ax-in2 624 ax-io 721 ax-5 1500 ax-7 1501 ax-gen 1502 ax-ie1 1546 ax-ie2 1547 ax-8 1557 ax-10 1558 ax-11 1559 ax-i12 1560 ax-bndl 1562 ax-4 1563 ax-17 1579 ax-i9 1583 ax-ial 1587 ax-i5r 1588 ax-14 2212 ax-ext 2220 ax-coll 4241 ax-sep 4244 ax-nul 4254 ax-pow 4306 ax-pr 4341 ax-un 4573 ax-setind 4679 |
| This theorem depends on definitions: df-bi 117 df-dc 847 df-3an 1011 df-tru 1405 df-fal 1408 df-nf 1514 df-sb 1816 df-eu 2089 df-mo 2090 df-clab 2225 df-cleq 2231 df-clel 2234 df-nfc 2381 df-ne 2421 df-ral 2533 df-rex 2534 df-reu 2535 df-rab 2537 df-v 2823 df-sbc 3052 df-csb 3148 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-if 3636 df-pw 3687 df-sn 3711 df-pr 3712 df-op 3714 df-uni 3931 df-int 3966 df-iun 4009 df-br 4126 df-opab 4188 df-mpt 4189 df-id 4433 df-suc 4511 df-iom 4733 df-xp 4775 df-rel 4776 df-cnv 4777 df-co 4778 df-dm 4779 df-rn 4780 df-res 4781 df-ima 4782 df-iota 5332 df-fun 5374 df-fn 5375 df-f 5376 df-f1 5377 df-fo 5378 df-f1o 5379 df-fv 5380 df-ov 6078 df-oprab 6079 df-mpo 6080 df-supp 6466 df-1o 6677 df-en 7013 df-fin 7015 df-fsupp 7276 |
| This theorem is referenced by: (None) |
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