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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 37488 | . 2 ⊢ ⦅𝐴⦆ = ({∅} × tag 𝐴) | |
| 2 | 0nep0 5316 | . . . 4 ⊢ ∅ ≠ {∅} | |
| 3 | 2 | necomi 3013 | . . 3 ⊢ {∅} ≠ ∅ |
| 4 | bj-tagn0 37469 | . . 3 ⊢ tag 𝐴 ≠ ∅ | |
| 5 | xpnz 6146 | . . . 4 ⊢ (({∅} ≠ ∅ ∧ tag 𝐴 ≠ ∅) ↔ ({∅} × tag 𝐴) ≠ ∅) | |
| 6 | 5 | biimpi 218 | . . 3 ⊢ (({∅} ≠ ∅ ∧ tag 𝐴 ≠ ∅) → ({∅} × tag 𝐴) ≠ ∅) |
| 7 | 3, 4, 6 | mp2an 702 | . 2 ⊢ ({∅} × tag 𝐴) ≠ ∅ |
| 8 | 1, 7 | eqnetri 3029 | 1 ⊢ ⦅𝐴⦆ ≠ ∅ |
| Colors of variables: wff setvar class |
| Syntax hints: ∧ wa 399 ≠ wne 2959 ∅c0 4287 {csn 4584 × cxp 5647 tag bj-ctag 37464 ⦅bj-c1upl 37487 |
| This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1817 ax-4 1831 ax-5 1932 ax-6 1989 ax-7 2030 ax-8 2146 ax-9 2154 ax-ext 2736 ax-sep 5248 ax-nul 5258 ax-pr 5392 |
| This theorem depends on definitions: df-bi 209 df-an 400 df-or 859 df-3an 1101 df-tru 1565 df-fal 1575 df-ex 1802 df-sb 2093 df-clab 2743 df-cleq 2756 df-clel 2839 df-ne 2960 df-ral 3079 df-rex 3089 df-rab 3417 df-v 3458 df-dif 3909 df-un 3911 df-in 3913 df-ss 3923 df-nul 4288 df-if 4483 df-sn 4585 df-pr 4587 df-op 4591 df-opab 5165 df-xp 5655 df-bj-tag 37465 df-bj-1upl 37488 |
| This theorem is referenced by: bj-2upln0 37513 |
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