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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 34305 | . 2 ⊢ ⦅𝐴⦆ = ({∅} × tag 𝐴) | |
2 | 0nep0 5250 | . . . 4 ⊢ ∅ ≠ {∅} | |
3 | 2 | necomi 3070 | . . 3 ⊢ {∅} ≠ ∅ |
4 | bj-tagn0 34286 | . . 3 ⊢ tag 𝐴 ≠ ∅ | |
5 | xpnz 6010 | . . . 4 ⊢ (({∅} ≠ ∅ ∧ tag 𝐴 ≠ ∅) ↔ ({∅} × tag 𝐴) ≠ ∅) | |
6 | 5 | biimpi 218 | . . 3 ⊢ (({∅} ≠ ∅ ∧ tag 𝐴 ≠ ∅) → ({∅} × tag 𝐴) ≠ ∅) |
7 | 3, 4, 6 | mp2an 690 | . 2 ⊢ ({∅} × tag 𝐴) ≠ ∅ |
8 | 1, 7 | eqnetri 3086 | 1 ⊢ ⦅𝐴⦆ ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ∧ wa 398 ≠ wne 3016 ∅c0 4290 {csn 4560 × cxp 5547 tag bj-ctag 34281 ⦅bj-c1upl 34304 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1792 ax-4 1806 ax-5 1907 ax-6 1966 ax-7 2011 ax-8 2112 ax-9 2120 ax-10 2141 ax-11 2157 ax-12 2173 ax-ext 2793 ax-sep 5195 ax-nul 5202 ax-pr 5321 |
This theorem depends on definitions: df-bi 209 df-an 399 df-or 844 df-3an 1085 df-tru 1536 df-ex 1777 df-nf 1781 df-sb 2066 df-mo 2618 df-eu 2650 df-clab 2800 df-cleq 2814 df-clel 2893 df-nfc 2963 df-ne 3017 df-ral 3143 df-rex 3144 df-rab 3147 df-v 3496 df-dif 3938 df-un 3940 df-in 3942 df-ss 3951 df-nul 4291 df-if 4467 df-sn 4561 df-pr 4563 df-op 4567 df-br 5059 df-opab 5121 df-xp 5555 df-rel 5556 df-cnv 5557 df-bj-tag 34282 df-bj-1upl 34305 |
This theorem is referenced by: bj-2upln0 34330 |
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