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Mirrors > Home > ILE Home > Th. List > mt2d | Unicode version |
Description: Modus tollens deduction. (Contributed by NM, 4-Jul-1994.) |
Ref | Expression |
---|---|
mt2d.1 |
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mt2d.2 |
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Ref | Expression |
---|---|
mt2d |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mt2d.1 |
. 2
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2 | mt2d.2 |
. . 3
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3 | 2 | con2d 624 |
. 2
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4 | 1, 3 | mpd 13 |
1
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Colors of variables: wff set class |
Syntax hints: ![]() ![]() |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-in1 614 ax-in2 615 |
This theorem is referenced by: nsyl3 626 mt2i 644 en2lp 4554 recnz 9346 xnn0dcle 9802 fznuz 10102 uznfz 10103 pcadd 12339 oddennn 12393 lgseisenlem1 14453 |
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