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| Mirrors > Home > ILE Home > Th. List > structcnvcnv | GIF version | ||
| Description: Two ways to express the relational part of a structure. (Contributed by Mario Carneiro, 29-Aug-2015.) |
| Ref | Expression |
|---|---|
| structcnvcnv | ⊢ (𝐹 Struct 𝑋 → ◡◡𝐹 = (𝐹 ∖ {∅})) |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | 0nelxp 4800 | . . . . . 6 ⊢ ¬ ∅ ∈ (V × V) | |
| 2 | cnvcnv 5238 | . . . . . . . 8 ⊢ ◡◡𝐹 = (𝐹 ∩ (V × V)) | |
| 3 | inss2 3452 | . . . . . . . 8 ⊢ (𝐹 ∩ (V × V)) ⊆ (V × V) | |
| 4 | 2, 3 | eqsstri 3280 | . . . . . . 7 ⊢ ◡◡𝐹 ⊆ (V × V) |
| 5 | 4 | sseli 3244 | . . . . . 6 ⊢ (∅ ∈ ◡◡𝐹 → ∅ ∈ (V × V)) |
| 6 | 1, 5 | mto 672 | . . . . 5 ⊢ ¬ ∅ ∈ ◡◡𝐹 |
| 7 | disjsn 3770 | . . . . 5 ⊢ ((◡◡𝐹 ∩ {∅}) = ∅ ↔ ¬ ∅ ∈ ◡◡𝐹) | |
| 8 | 6, 7 | mpbir 146 | . . . 4 ⊢ (◡◡𝐹 ∩ {∅}) = ∅ |
| 9 | cnvcnvss 5240 | . . . . 5 ⊢ ◡◡𝐹 ⊆ 𝐹 | |
| 10 | reldisj 3576 | . . . . 5 ⊢ (◡◡𝐹 ⊆ 𝐹 → ((◡◡𝐹 ∩ {∅}) = ∅ ↔ ◡◡𝐹 ⊆ (𝐹 ∖ {∅}))) | |
| 11 | 9, 10 | ax-mp 5 | . . . 4 ⊢ ((◡◡𝐹 ∩ {∅}) = ∅ ↔ ◡◡𝐹 ⊆ (𝐹 ∖ {∅})) |
| 12 | 8, 11 | mpbi 145 | . . 3 ⊢ ◡◡𝐹 ⊆ (𝐹 ∖ {∅}) |
| 13 | 12 | a1i 9 | . 2 ⊢ (𝐹 Struct 𝑋 → ◡◡𝐹 ⊆ (𝐹 ∖ {∅})) |
| 14 | structn0fun 13348 | . . . . 5 ⊢ (𝐹 Struct 𝑋 → Fun (𝐹 ∖ {∅})) | |
| 15 | funrel 5392 | . . . . 5 ⊢ (Fun (𝐹 ∖ {∅}) → Rel (𝐹 ∖ {∅})) | |
| 16 | 14, 15 | syl 14 | . . . 4 ⊢ (𝐹 Struct 𝑋 → Rel (𝐹 ∖ {∅})) |
| 17 | dfrel2 5236 | . . . 4 ⊢ (Rel (𝐹 ∖ {∅}) ↔ ◡◡(𝐹 ∖ {∅}) = (𝐹 ∖ {∅})) | |
| 18 | 16, 17 | sylib 122 | . . 3 ⊢ (𝐹 Struct 𝑋 → ◡◡(𝐹 ∖ {∅}) = (𝐹 ∖ {∅})) |
| 19 | difss 3355 | . . . 4 ⊢ (𝐹 ∖ {∅}) ⊆ 𝐹 | |
| 20 | cnvss 4951 | . . . 4 ⊢ ((𝐹 ∖ {∅}) ⊆ 𝐹 → ◡(𝐹 ∖ {∅}) ⊆ ◡𝐹) | |
| 21 | cnvss 4951 | . . . 4 ⊢ (◡(𝐹 ∖ {∅}) ⊆ ◡𝐹 → ◡◡(𝐹 ∖ {∅}) ⊆ ◡◡𝐹) | |
| 22 | 19, 20, 21 | mp2b 8 | . . 3 ⊢ ◡◡(𝐹 ∖ {∅}) ⊆ ◡◡𝐹 |
| 23 | 18, 22 | eqsstrrdi 3301 | . 2 ⊢ (𝐹 Struct 𝑋 → (𝐹 ∖ {∅}) ⊆ ◡◡𝐹) |
| 24 | 13, 23 | eqssd 3265 | 1 ⊢ (𝐹 Struct 𝑋 → ◡◡𝐹 = (𝐹 ∖ {∅})) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 105 = wceq 1402 ∈ wcel 2209 Vcvv 2821 ∖ cdif 3217 ∩ cin 3219 ⊆ wss 3220 ∅c0 3520 {csn 3708 class class class wbr 4128 × cxp 4770 ◡ccnv 4771 Rel wrel 4777 Fun wfun 5369 Struct cstr 13331 |
| 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-sep 4247 ax-pow 4309 ax-pr 4344 |
| This theorem depends on definitions: df-bi 117 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-rab 2537 df-v 2823 df-dif 3222 df-un 3224 df-in 3226 df-ss 3233 df-nul 3521 df-pw 3690 df-sn 3714 df-pr 3715 df-op 3717 df-uni 3934 df-br 4129 df-opab 4191 df-xp 4778 df-rel 4779 df-cnv 4780 df-co 4781 df-dm 4782 df-iota 5335 df-fun 5377 df-fv 5383 df-struct 13337 |
| This theorem is referenced by: structfung 13352 |
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