Mathbox for Thierry Arnoux |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > opabssi | Structured version Visualization version GIF version |
Description: Sufficient condition for a collection of ordered pairs to be a subclass of a relation. (Contributed by Peter Mazsa, 21-Oct-2019.) (Revised by Thierry Arnoux, 18-Feb-2022.) |
Ref | Expression |
---|---|
opabssi.1 | ⊢ (𝜑 → 〈𝑥, 𝑦〉 ∈ 𝐴) |
Ref | Expression |
---|---|
opabssi | ⊢ {〈𝑥, 𝑦〉 ∣ 𝜑} ⊆ 𝐴 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-opab 5131 | . 2 ⊢ {〈𝑥, 𝑦〉 ∣ 𝜑} = {𝑧 ∣ ∃𝑥∃𝑦(𝑧 = 〈𝑥, 𝑦〉 ∧ 𝜑)} | |
2 | eleq1 2902 | . . . . . 6 ⊢ (𝑧 = 〈𝑥, 𝑦〉 → (𝑧 ∈ 𝐴 ↔ 〈𝑥, 𝑦〉 ∈ 𝐴)) | |
3 | 2 | biimprd 250 | . . . . 5 ⊢ (𝑧 = 〈𝑥, 𝑦〉 → (〈𝑥, 𝑦〉 ∈ 𝐴 → 𝑧 ∈ 𝐴)) |
4 | opabssi.1 | . . . . 5 ⊢ (𝜑 → 〈𝑥, 𝑦〉 ∈ 𝐴) | |
5 | 3, 4 | impel 508 | . . . 4 ⊢ ((𝑧 = 〈𝑥, 𝑦〉 ∧ 𝜑) → 𝑧 ∈ 𝐴) |
6 | 5 | exlimivv 1933 | . . 3 ⊢ (∃𝑥∃𝑦(𝑧 = 〈𝑥, 𝑦〉 ∧ 𝜑) → 𝑧 ∈ 𝐴) |
7 | 6 | abssi 4048 | . 2 ⊢ {𝑧 ∣ ∃𝑥∃𝑦(𝑧 = 〈𝑥, 𝑦〉 ∧ 𝜑)} ⊆ 𝐴 |
8 | 1, 7 | eqsstri 4003 | 1 ⊢ {〈𝑥, 𝑦〉 ∣ 𝜑} ⊆ 𝐴 |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ∧ wa 398 = wceq 1537 ∃wex 1780 ∈ wcel 2114 {cab 2801 ⊆ wss 3938 〈cop 4575 {copab 5130 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1796 ax-4 1810 ax-5 1911 ax-6 1970 ax-7 2015 ax-8 2116 ax-9 2124 ax-10 2145 ax-11 2161 ax-12 2177 ax-ext 2795 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-tru 1540 df-ex 1781 df-nf 1785 df-sb 2070 df-clab 2802 df-cleq 2816 df-clel 2895 df-nfc 2965 df-in 3945 df-ss 3954 df-opab 5131 |
This theorem is referenced by: opabid2ss 30367 |
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