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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 37379 | . 2 ⊢ ⦅𝐴, 𝐵⦆ = (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) | |
| 2 | bj-1upln0 37377 | . . . . 5 ⊢ ⦅𝐴⦆ ≠ ∅ | |
| 3 | 0pss 4378 | . . . . 5 ⊢ (∅ ⊊ ⦅𝐴⦆ ↔ ⦅𝐴⦆ ≠ ∅) | |
| 4 | 2, 3 | mpbir 233 | . . . 4 ⊢ ∅ ⊊ ⦅𝐴⦆ |
| 5 | ssun1 4110 | . . . 4 ⊢ ⦅𝐴⦆ ⊆ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) | |
| 6 | psssstr 4043 | . . . 4 ⊢ ((∅ ⊊ ⦅𝐴⦆ ∧ ⦅𝐴⦆ ⊆ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵))) → ∅ ⊊ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵))) | |
| 7 | 4, 5, 6 | mp2an 699 | . . 3 ⊢ ∅ ⊊ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) |
| 8 | 0pss 4378 | . . 3 ⊢ (∅ ⊊ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) ↔ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) ≠ ∅) | |
| 9 | 7, 8 | mpbi 232 | . 2 ⊢ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) ≠ ∅ |
| 10 | 1, 9 | eqnetri 3006 | 1 ⊢ ⦅𝐴, 𝐵⦆ ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ≠ wne 2936 ∪ cun 3883 ⊆ wss 3885 ⊊ wpss 3886 ∅c0 4264 {csn 4558 × cxp 5619 1oc1o 8392 tag bj-ctag 37342 ⦅bj-c1upl 37365 ⦅bj-c2uple 37378 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1803 ax-4 1817 ax-5 1918 ax-6 1975 ax-7 2016 ax-8 2123 ax-9 2131 ax-ext 2713 ax-sep 5221 ax-nul 5231 ax-pr 5365 |
| This theorem depends on definitions: df-bi 209 df-an 398 df-or 855 df-3an 1095 df-tru 1551 df-fal 1561 df-ex 1788 df-sb 2075 df-clab 2720 df-cleq 2733 df-clel 2816 df-ne 2937 df-ral 3056 df-rex 3066 df-rab 3394 df-v 3435 df-dif 3888 df-un 3890 df-in 3892 df-ss 3902 df-pss 3905 df-nul 4265 df-if 4458 df-sn 4559 df-pr 4561 df-op 4565 df-opab 5138 df-xp 5627 df-bj-tag 37343 df-bj-1upl 37366 df-bj-2upl 37379 |
| This theorem is referenced by: (None) |
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