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Mirrors > Home > MPE Home > Th. List > cotrg | Structured version Visualization version GIF version |
Description: Two ways of saying that the composition of two relations is included in a third relation. See its special instance cotr 5965 for the main application. (Contributed by NM, 27-Dec-1996.) (Proof shortened by Andrew Salmon, 27-Aug-2011.) Generalized from its special instance cotr 5965. (Revised by Richard Penner, 24-Dec-2019.) |
Ref | Expression |
---|---|
cotrg | ⊢ ((𝐴 ∘ 𝐵) ⊆ 𝐶 ↔ ∀𝑥∀𝑦∀𝑧((𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧) → 𝑥𝐶𝑧)) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-co 5557 | . . . 4 ⊢ (𝐴 ∘ 𝐵) = {〈𝑥, 𝑧〉 ∣ ∃𝑦(𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧)} | |
2 | 1 | relopabi 5687 | . . 3 ⊢ Rel (𝐴 ∘ 𝐵) |
3 | ssrel 5650 | . . 3 ⊢ (Rel (𝐴 ∘ 𝐵) → ((𝐴 ∘ 𝐵) ⊆ 𝐶 ↔ ∀𝑥∀𝑧(〈𝑥, 𝑧〉 ∈ (𝐴 ∘ 𝐵) → 〈𝑥, 𝑧〉 ∈ 𝐶))) | |
4 | 2, 3 | ax-mp 5 | . 2 ⊢ ((𝐴 ∘ 𝐵) ⊆ 𝐶 ↔ ∀𝑥∀𝑧(〈𝑥, 𝑧〉 ∈ (𝐴 ∘ 𝐵) → 〈𝑥, 𝑧〉 ∈ 𝐶)) |
5 | vex 3495 | . . . . . . . 8 ⊢ 𝑥 ∈ V | |
6 | vex 3495 | . . . . . . . 8 ⊢ 𝑧 ∈ V | |
7 | 5, 6 | opelco 5735 | . . . . . . 7 ⊢ (〈𝑥, 𝑧〉 ∈ (𝐴 ∘ 𝐵) ↔ ∃𝑦(𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧)) |
8 | df-br 5058 | . . . . . . . 8 ⊢ (𝑥𝐶𝑧 ↔ 〈𝑥, 𝑧〉 ∈ 𝐶) | |
9 | 8 | bicomi 225 | . . . . . . 7 ⊢ (〈𝑥, 𝑧〉 ∈ 𝐶 ↔ 𝑥𝐶𝑧) |
10 | 7, 9 | imbi12i 352 | . . . . . 6 ⊢ ((〈𝑥, 𝑧〉 ∈ (𝐴 ∘ 𝐵) → 〈𝑥, 𝑧〉 ∈ 𝐶) ↔ (∃𝑦(𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧) → 𝑥𝐶𝑧)) |
11 | 19.23v 1934 | . . . . . 6 ⊢ (∀𝑦((𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧) → 𝑥𝐶𝑧) ↔ (∃𝑦(𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧) → 𝑥𝐶𝑧)) | |
12 | 10, 11 | bitr4i 279 | . . . . 5 ⊢ ((〈𝑥, 𝑧〉 ∈ (𝐴 ∘ 𝐵) → 〈𝑥, 𝑧〉 ∈ 𝐶) ↔ ∀𝑦((𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧) → 𝑥𝐶𝑧)) |
13 | 12 | albii 1811 | . . . 4 ⊢ (∀𝑧(〈𝑥, 𝑧〉 ∈ (𝐴 ∘ 𝐵) → 〈𝑥, 𝑧〉 ∈ 𝐶) ↔ ∀𝑧∀𝑦((𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧) → 𝑥𝐶𝑧)) |
14 | alcom 2153 | . . . 4 ⊢ (∀𝑧∀𝑦((𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧) → 𝑥𝐶𝑧) ↔ ∀𝑦∀𝑧((𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧) → 𝑥𝐶𝑧)) | |
15 | 13, 14 | bitri 276 | . . 3 ⊢ (∀𝑧(〈𝑥, 𝑧〉 ∈ (𝐴 ∘ 𝐵) → 〈𝑥, 𝑧〉 ∈ 𝐶) ↔ ∀𝑦∀𝑧((𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧) → 𝑥𝐶𝑧)) |
16 | 15 | albii 1811 | . 2 ⊢ (∀𝑥∀𝑧(〈𝑥, 𝑧〉 ∈ (𝐴 ∘ 𝐵) → 〈𝑥, 𝑧〉 ∈ 𝐶) ↔ ∀𝑥∀𝑦∀𝑧((𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧) → 𝑥𝐶𝑧)) |
17 | 4, 16 | bitri 276 | 1 ⊢ ((𝐴 ∘ 𝐵) ⊆ 𝐶 ↔ ∀𝑥∀𝑦∀𝑧((𝑥𝐵𝑦 ∧ 𝑦𝐴𝑧) → 𝑥𝐶𝑧)) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 207 ∧ wa 396 ∀wal 1526 ∃wex 1771 ∈ wcel 2105 ⊆ wss 3933 〈cop 4563 class class class wbr 5057 ∘ ccom 5552 Rel wrel 5553 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1787 ax-4 1801 ax-5 1902 ax-6 1961 ax-7 2006 ax-8 2107 ax-9 2115 ax-10 2136 ax-11 2151 ax-12 2167 ax-ext 2790 ax-sep 5194 ax-nul 5201 ax-pr 5320 |
This theorem depends on definitions: df-bi 208 df-an 397 df-or 842 df-3an 1081 df-tru 1531 df-ex 1772 df-nf 1776 df-sb 2061 df-mo 2615 df-eu 2647 df-clab 2797 df-cleq 2811 df-clel 2890 df-nfc 2960 df-rab 3144 df-v 3494 df-dif 3936 df-un 3938 df-in 3940 df-ss 3949 df-nul 4289 df-if 4464 df-sn 4558 df-pr 4560 df-op 4564 df-br 5058 df-opab 5120 df-xp 5554 df-rel 5555 df-co 5557 |
This theorem is referenced by: cotr 5965 cotr2g 14324 |
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