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Mirrors > Home > ILE Home > Th. List > con3 | Unicode version |
Description: Contraposition. Theorem *2.16 of [WhiteheadRussell] p. 103. (Contributed by NM, 5-Aug-1993.) (Proof shortened by Wolf Lammen, 13-Feb-2013.) |
Ref | Expression |
---|---|
con3 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | id 19 | . 2 | |
2 | 1 | con3d 561 | 1 |
Colors of variables: wff set class |
Syntax hints: wn 3 wi 4 |
This theorem was proved from axioms: ax-1 5 ax-2 6 ax-mp 7 ax-in1 544 ax-in2 545 |
This theorem is referenced by: mtt 610 con34bdc 765 annimim 782 hbnt 1543 ralf0 3324 ltleletr 7100 ltnsym 7104 |
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