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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 4779 | . . . . . 6 ⊢ ¬ ∅ ∈ (V × V) | |
| 2 | cnvcnv 5217 | . . . . . . . 8 ⊢ ◡◡𝐹 = (𝐹 ∩ (V × V)) | |
| 3 | inss2 3444 | . . . . . . . 8 ⊢ (𝐹 ∩ (V × V)) ⊆ (V × V) | |
| 4 | 2, 3 | eqsstri 3272 | . . . . . . 7 ⊢ ◡◡𝐹 ⊆ (V × V) |
| 5 | 4 | sseli 3236 | . . . . . 6 ⊢ (∅ ∈ ◡◡𝐹 → ∅ ∈ (V × V)) |
| 6 | 1, 5 | mto 668 | . . . . 5 ⊢ ¬ ∅ ∈ ◡◡𝐹 |
| 7 | disjsn 3753 | . . . . 5 ⊢ ((◡◡𝐹 ∩ {∅}) = ∅ ↔ ¬ ∅ ∈ ◡◡𝐹) | |
| 8 | 6, 7 | mpbir 146 | . . . 4 ⊢ (◡◡𝐹 ∩ {∅}) = ∅ |
| 9 | cnvcnvss 5219 | . . . . 5 ⊢ ◡◡𝐹 ⊆ 𝐹 | |
| 10 | reldisj 3562 | . . . . 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 13246 | . . . . 5 ⊢ (𝐹 Struct 𝑋 → Fun (𝐹 ∖ {∅})) | |
| 15 | funrel 5371 | . . . . 5 ⊢ (Fun (𝐹 ∖ {∅}) → Rel (𝐹 ∖ {∅})) | |
| 16 | 14, 15 | syl 14 | . . . 4 ⊢ (𝐹 Struct 𝑋 → Rel (𝐹 ∖ {∅})) |
| 17 | dfrel2 5215 | . . . 4 ⊢ (Rel (𝐹 ∖ {∅}) ↔ ◡◡(𝐹 ∖ {∅}) = (𝐹 ∖ {∅})) | |
| 18 | 16, 17 | sylib 122 | . . 3 ⊢ (𝐹 Struct 𝑋 → ◡◡(𝐹 ∖ {∅}) = (𝐹 ∖ {∅})) |
| 19 | difss 3347 | . . . 4 ⊢ (𝐹 ∖ {∅}) ⊆ 𝐹 | |
| 20 | cnvss 4930 | . . . 4 ⊢ ((𝐹 ∖ {∅}) ⊆ 𝐹 → ◡(𝐹 ∖ {∅}) ⊆ ◡𝐹) | |
| 21 | cnvss 4930 | . . . 4 ⊢ (◡(𝐹 ∖ {∅}) ⊆ ◡𝐹 → ◡◡(𝐹 ∖ {∅}) ⊆ ◡◡𝐹) | |
| 22 | 19, 20, 21 | mp2b 8 | . . 3 ⊢ ◡◡(𝐹 ∖ {∅}) ⊆ ◡◡𝐹 |
| 23 | 18, 22 | eqsstrrdi 3293 | . 2 ⊢ (𝐹 Struct 𝑋 → (𝐹 ∖ {∅}) ⊆ ◡◡𝐹) |
| 24 | 13, 23 | eqssd 3257 | 1 ⊢ (𝐹 Struct 𝑋 → ◡◡𝐹 = (𝐹 ∖ {∅})) |
| Colors of variables: wff set class |
| Syntax hints: ¬ wn 3 → wi 4 ↔ wb 105 = wceq 1398 ∈ wcel 2205 Vcvv 2815 ∖ cdif 3210 ∩ cin 3212 ⊆ wss 3213 ∅c0 3510 {csn 3691 class class class wbr 4111 × cxp 4749 ◡ccnv 4750 Rel wrel 4756 Fun wfun 5348 Struct cstr 13229 |
| 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 619 ax-in2 620 ax-io 717 ax-5 1496 ax-7 1497 ax-gen 1498 ax-ie1 1542 ax-ie2 1543 ax-8 1553 ax-10 1554 ax-11 1555 ax-i12 1556 ax-bndl 1558 ax-4 1559 ax-17 1575 ax-i9 1579 ax-ial 1583 ax-i5r 1584 ax-14 2208 ax-ext 2216 ax-sep 4230 ax-pow 4289 ax-pr 4324 |
| This theorem depends on definitions: df-bi 117 df-3an 1007 df-tru 1401 df-fal 1404 df-nf 1510 df-sb 1812 df-eu 2085 df-mo 2086 df-clab 2221 df-cleq 2227 df-clel 2230 df-nfc 2375 df-ne 2415 df-ral 2527 df-rex 2528 df-rab 2531 df-v 2817 df-dif 3215 df-un 3217 df-in 3219 df-ss 3226 df-nul 3511 df-pw 3673 df-sn 3697 df-pr 3698 df-op 3700 df-uni 3917 df-br 4112 df-opab 4174 df-xp 4757 df-rel 4758 df-cnv 4759 df-co 4760 df-dm 4761 df-iota 5314 df-fun 5356 df-fv 5362 df-struct 13235 |
| This theorem is referenced by: structfung 13250 |
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