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| Mirrors > Home > MPE Home > Th. List > Mathboxes > bj-1upln0 | Structured version Visualization version GIF version | ||
| Description: A monuple is nonempty. (Contributed by BJ, 6-Apr-2019.) |
| Ref | Expression |
|---|---|
| bj-1upln0 | ⊢ ⦅𝐴⦆ ≠ ∅ |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | df-bj-1upl 37325 | . 2 ⊢ ⦅𝐴⦆ = ({∅} × tag 𝐴) | |
| 2 | 0nep0 5296 | . . . 4 ⊢ ∅ ≠ {∅} | |
| 3 | 2 | necomi 2987 | . . 3 ⊢ {∅} ≠ ∅ |
| 4 | bj-tagn0 37306 | . . 3 ⊢ tag 𝐴 ≠ ∅ | |
| 5 | xpnz 6119 | . . . 4 ⊢ (({∅} ≠ ∅ ∧ tag 𝐴 ≠ ∅) ↔ ({∅} × tag 𝐴) ≠ ∅) | |
| 6 | 5 | biimpi 216 | . . 3 ⊢ (({∅} ≠ ∅ ∧ tag 𝐴 ≠ ∅) → ({∅} × tag 𝐴) ≠ ∅) |
| 7 | 3, 4, 6 | mp2an 693 | . 2 ⊢ ({∅} × tag 𝐴) ≠ ∅ |
| 8 | 1, 7 | eqnetri 3003 | 1 ⊢ ⦅𝐴⦆ ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∧ wa 395 ≠ wne 2933 ∅c0 4274 {csn 4568 × cxp 5624 tag bj-ctag 37301 ⦅bj-c1upl 37324 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1797 ax-4 1811 ax-5 1912 ax-6 1969 ax-7 2010 ax-8 2116 ax-9 2124 ax-ext 2709 ax-sep 5232 ax-nul 5242 ax-pr 5372 |
| This theorem depends on definitions: df-bi 207 df-an 396 df-or 849 df-3an 1089 df-tru 1545 df-fal 1555 df-ex 1782 df-sb 2069 df-clab 2716 df-cleq 2729 df-clel 2812 df-ne 2934 df-ral 3053 df-rex 3063 df-rab 3391 df-v 3432 df-dif 3893 df-un 3895 df-in 3897 df-ss 3907 df-nul 4275 df-if 4468 df-sn 4569 df-pr 4571 df-op 4575 df-opab 5149 df-xp 5632 df-bj-tag 37302 df-bj-1upl 37325 |
| This theorem is referenced by: bj-2upln0 37350 |
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