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Mirrors > Home > MPE Home > Th. List > syl21anc | Structured version Visualization version Unicode version |
Description: Syllogism combined with contraction. (Contributed by Jeff Hankins, 1-Aug-2009.) |
Ref | Expression |
---|---|
syl12anc.1 | |
syl12anc.2 | |
syl12anc.3 | |
syl21anc.4 |
Ref | Expression |
---|---|
syl21anc |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | syl12anc.1 | . . 3 | |
2 | syl12anc.2 | . . 3 | |
3 | syl12anc.3 | . . 3 | |
4 | 1, 2, 3 | jca31 557 | . 2 |
5 | syl21anc.4 | . 2 | |
6 | 4, 5 | syl 17 | 1 |
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