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Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-2upln0 | Structured version Visualization version GIF version |
Description: A couple is nonempty. (Contributed by BJ, 21-Apr-2019.) |
Ref | Expression |
---|---|
bj-2upln0 | ⊢ ⦅𝐴, 𝐵⦆ ≠ ∅ |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | df-bj-2upl 32192 | . 2 ⊢ ⦅𝐴, 𝐵⦆ = (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) | |
2 | bj-1upln0 32190 | . . . . 5 ⊢ ⦅𝐴⦆ ≠ ∅ | |
3 | 0pss 3965 | . . . . 5 ⊢ (∅ ⊊ ⦅𝐴⦆ ↔ ⦅𝐴⦆ ≠ ∅) | |
4 | 2, 3 | mpbir 220 | . . . 4 ⊢ ∅ ⊊ ⦅𝐴⦆ |
5 | ssun1 3738 | . . . 4 ⊢ ⦅𝐴⦆ ⊆ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) | |
6 | psssstr 3675 | . . . 4 ⊢ ((∅ ⊊ ⦅𝐴⦆ ∧ ⦅𝐴⦆ ⊆ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵))) → ∅ ⊊ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵))) | |
7 | 4, 5, 6 | mp2an 704 | . . 3 ⊢ ∅ ⊊ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) |
8 | 0pss 3965 | . . 3 ⊢ (∅ ⊊ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) ↔ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) ≠ ∅) | |
9 | 7, 8 | mpbi 219 | . 2 ⊢ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) ≠ ∅ |
10 | 1, 9 | eqnetri 2852 | 1 ⊢ ⦅𝐴, 𝐵⦆ ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ≠ wne 2780 ∪ cun 3538 ⊆ wss 3540 ⊊ wpss 3541 ∅c0 3874 {csn 4125 × cxp 5036 1𝑜c1o 7440 tag bj-ctag 32155 ⦅bj-c1upl 32178 ⦅bj-c2uple 32191 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1713 ax-4 1728 ax-5 1827 ax-6 1875 ax-7 1922 ax-9 1986 ax-10 2006 ax-11 2021 ax-12 2034 ax-13 2234 ax-ext 2590 ax-sep 4709 ax-nul 4717 ax-pr 4833 |
This theorem depends on definitions: df-bi 196 df-or 384 df-an 385 df-3an 1033 df-tru 1478 df-ex 1696 df-nf 1701 df-sb 1868 df-eu 2462 df-mo 2463 df-clab 2597 df-cleq 2603 df-clel 2606 df-nfc 2740 df-ne 2782 df-ral 2901 df-rex 2902 df-rab 2905 df-v 3175 df-dif 3543 df-un 3545 df-in 3547 df-ss 3554 df-pss 3556 df-nul 3875 df-if 4037 df-sn 4126 df-pr 4128 df-op 4132 df-br 4584 df-opab 4644 df-xp 5044 df-rel 5045 df-cnv 5046 df-bj-tag 32156 df-bj-1upl 32179 df-bj-2upl 32192 |
This theorem is referenced by: (None) |
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