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Mirrors > Home > ILE Home > Th. List > mtbi | Unicode version |
Description: An inference from a biconditional, related to modus tollens. (Contributed by NM, 15-Nov-1994.) (Proof shortened by Wolf Lammen, 25-Oct-2012.) |
Ref | Expression |
---|---|
mtbi.1 |
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mtbi.2 |
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Ref | Expression |
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mtbi |
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Step | Hyp | Ref | Expression |
---|---|---|---|
1 | mtbi.1 |
. 2
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2 | mtbi.2 |
. . 3
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3 | 2 | biimpri 133 |
. 2
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4 | 1, 3 | mto 663 |
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-ia1 106 ax-ia2 107 ax-ia3 108 ax-in1 615 ax-in2 616 |
This theorem depends on definitions: df-bi 117 |
This theorem is referenced by: mtbir 672 vnex 4149 onsucelsucexmid 4547 dtruex 4576 dmsn0 5114 php5 6886 exmidonfinlem 7222 ndvdsi 11970 nprmi 12156 unennn 12448 bj-vprc 15106 bj-vnex 15108 trirec0xor 15252 |
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