Mathbox for Alexander van der Vekens |
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Mirrors > Home > MPE Home > Th. List > Mathboxes > 2rexsb | Structured version Visualization version Unicode version |
Description: An equivalent expression for double restricted existence, analogous to rexsb 41168. (Contributed by Alexander van der Vekens, 1-Jul-2017.) |
Ref | Expression |
---|---|
2rexsb |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | rexsb 41168 | . . . 4 | |
2 | 1 | rexbii 3041 | . . 3 |
3 | rexcom 3099 | . . 3 | |
4 | 2, 3 | bitri 264 | . 2 |
5 | rexsb 41168 | . . . . 5 | |
6 | impexp 462 | . . . . . . . . 9 | |
7 | 6 | albii 1747 | . . . . . . . 8 |
8 | 19.21v 1868 | . . . . . . . 8 | |
9 | 7, 8 | bitr2i 265 | . . . . . . 7 |
10 | 9 | albii 1747 | . . . . . 6 |
11 | 10 | rexbii 3041 | . . . . 5 |
12 | 5, 11 | bitri 264 | . . . 4 |
13 | 12 | rexbii 3041 | . . 3 |
14 | rexcom 3099 | . . 3 | |
15 | 13, 14 | bitri 264 | . 2 |
16 | 4, 15 | bitri 264 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wi 4 wb 196 wa 384 wal 1481 wrex 2913 |
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 |
This theorem depends on definitions: df-bi 197 df-or 385 df-an 386 df-tru 1486 df-ex 1705 df-nf 1710 df-sb 1881 df-cleq 2615 df-clel 2618 df-nfc 2753 df-ral 2917 df-rex 2918 |
This theorem is referenced by: (None) |
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