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Mirrors > Home > ILE Home > Th. List > mt2 | Unicode version |
Description: A rule similar to modus tollens. (Contributed by NM, 19-Aug-1993.) (Proof shortened by Wolf Lammen, 10-Sep-2013.) |
Ref | Expression |
---|---|
mt2.1 |
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mt2.2 |
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Ref | Expression |
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mt2 |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mt2.1 |
. . 3
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2 | 1 | a1i 9 |
. 2
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3 | mt2.2 |
. 2
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4 | 2, 3 | pm2.65i 611 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-in1 586 ax-in2 587 |
This theorem is referenced by: 0nnn 8650 nn0ge2m1nn 8934 xsubge0 9550 |
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