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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 32999 | . 2 ⊢ ⦅𝐴, 𝐵⦆ = (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) | |
2 | bj-1upln0 32997 | . . . . 5 ⊢ ⦅𝐴⦆ ≠ ∅ | |
3 | 0pss 4013 | . . . . 5 ⊢ (∅ ⊊ ⦅𝐴⦆ ↔ ⦅𝐴⦆ ≠ ∅) | |
4 | 2, 3 | mpbir 221 | . . . 4 ⊢ ∅ ⊊ ⦅𝐴⦆ |
5 | ssun1 3776 | . . . 4 ⊢ ⦅𝐴⦆ ⊆ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) | |
6 | psssstr 3713 | . . . 4 ⊢ ((∅ ⊊ ⦅𝐴⦆ ∧ ⦅𝐴⦆ ⊆ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵))) → ∅ ⊊ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵))) | |
7 | 4, 5, 6 | mp2an 708 | . . 3 ⊢ ∅ ⊊ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) |
8 | 0pss 4013 | . . 3 ⊢ (∅ ⊊ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) ↔ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) ≠ ∅) | |
9 | 7, 8 | mpbi 220 | . 2 ⊢ (⦅𝐴⦆ ∪ ({1𝑜} × tag 𝐵)) ≠ ∅ |
10 | 1, 9 | eqnetri 2864 | 1 ⊢ ⦅𝐴, 𝐵⦆ ≠ ∅ |
Colors of variables: wff setvar class |
Syntax hints: ≠ wne 2794 ∪ cun 3572 ⊆ wss 3574 ⊊ wpss 3575 ∅c0 3915 {csn 4177 × cxp 5112 1𝑜c1o 7553 tag bj-ctag 32962 ⦅bj-c1upl 32985 ⦅bj-c2uple 32998 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 ax-gen 1722 ax-4 1737 ax-5 1839 ax-6 1888 ax-7 1935 ax-9 1999 ax-10 2019 ax-11 2034 ax-12 2047 ax-13 2246 ax-ext 2602 ax-sep 4781 ax-nul 4789 ax-pr 4906 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-3an 1039 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-eu 2474 df-mo 2475 df-clab 2609 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ne 2795 df-ral 2917 df-rex 2918 df-rab 2921 df-v 3202 df-dif 3577 df-un 3579 df-in 3581 df-ss 3588 df-pss 3590 df-nul 3916 df-if 4087 df-sn 4178 df-pr 4180 df-op 4184 df-br 4654 df-opab 4713 df-xp 5120 df-rel 5121 df-cnv 5122 df-bj-tag 32963 df-bj-1upl 32986 df-bj-2upl 32999 |
This theorem is referenced by: (None) |
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