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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 37595 | . 2 ⊢ ⦅𝐴, 𝐵⦆ = (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) | |
| 2 | bj-1upln0 37593 | . . . . 5 ⊢ ⦅𝐴⦆ ≠ ∅ | |
| 3 | 0pss 4373 | . . . . 5 ⊢ (∅ ⊊ ⦅𝐴⦆ ↔ ⦅𝐴⦆ ≠ ∅) | |
| 4 | 2, 3 | mpbir 234 | . . . 4 ⊢ ∅ ⊊ ⦅𝐴⦆ |
| 5 | ssun1 4139 | . . . 4 ⊢ ⦅𝐴⦆ ⊆ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) | |
| 6 | psssstr 4072 | . . . 4 ⊢ ((∅ ⊊ ⦅𝐴⦆ ∧ ⦅𝐴⦆ ⊆ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵))) → ∅ ⊊ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵))) | |
| 7 | 4, 5, 6 | mp2an 704 | . . 3 ⊢ ∅ ⊊ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) |
| 8 | 0pss 4373 | . . 3 ⊢ (∅ ⊊ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) ↔ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) ≠ ∅) | |
| 9 | 7, 8 | mpbi 233 | . 2 ⊢ (⦅𝐴⦆ ∪ ({1o} × tag 𝐵)) ≠ ∅ |
| 10 | 1, 9 | eqnetri 3035 | 1 ⊢ ⦅𝐴, 𝐵⦆ ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ≠ wne 2965 ∪ cun 3911 ⊆ wss 3913 ⊊ wpss 3914 ∅c0 4294 {csn 4594 × cxp 5663 1oc1o 8449 tag bj-ctag 37558 ⦅bj-c1upl 37581 ⦅bj-c2uple 37594 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1823 ax-4 1837 ax-5 1938 ax-6 1995 ax-7 2036 ax-8 2152 ax-9 2160 ax-ext 2742 ax-sep 5262 ax-nul 5274 ax-pr 5408 |
| This theorem depends on definitions: df-bi 210 df-an 401 df-or 861 df-3an 1103 df-tru 1571 df-fal 1581 df-ex 1808 df-sb 2099 df-clab 2749 df-cleq 2762 df-clel 2845 df-ne 2966 df-ral 3087 df-rex 3097 df-rab 3424 df-v 3464 df-dif 3916 df-un 3918 df-in 3920 df-ss 3930 df-pss 3933 df-nul 4295 df-if 4493 df-sn 4595 df-pr 4597 df-op 4601 df-opab 5179 df-xp 5671 df-bj-tag 37559 df-bj-1upl 37582 df-bj-2upl 37595 |
| This theorem is referenced by: (None) |
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