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Mirrors > Home > NFE Home > Th. List > mtand | Unicode version |
Description: A modus tollens deduction. (Contributed by Jeff Hankins, 19-Aug-2009.) |
Ref | Expression |
---|---|
mtand.1 | |
mtand.2 |
Ref | Expression |
---|---|
mtand |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mtand.1 | . 2 | |
2 | mtand.2 | . . 3 | |
3 | 2 | ex 423 | . 2 |
4 | 1, 3 | mtod 168 | 1 |
Colors of variables: wff setvar class |
Syntax hints: wn 3 wi 4 wa 358 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 177 df-an 360 |
This theorem is referenced by: tfinnn 4534 sfin111 4536 nchoicelem5 6293 |
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