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Mirrors > Home > NFE Home > Th. List > pm2.21d | Unicode version |
Description: A contradiction implies anything. Deduction from pm2.21 100. (Contributed by NM, 10-Feb-1996.) |
Ref | Expression |
---|---|
pm2.21d.1 |
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Ref | Expression |
---|---|
pm2.21d |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm2.21d.1 |
. . 3
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2 | 1 | a1d 22 |
. 2
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3 | 2 | con4d 97 |
1
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Colors of variables: wff setvar class |
Syntax hints: ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem is referenced by: pm2.21dd 99 pm2.21 100 2falsed 340 pm5.14 856 ecase2d 906 prlem1 928 sbc2or 3055 eq0rdv 3586 rzal 3652 ssofss 4077 tfinltfin 4502 clos1nrel 5887 nchoicelem12 6301 |
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