theorem ltpr2tr (a b c: nat): $ a < c $ > $ a < b, c $;
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ltletr | a < c -> c <= b, c -> a < b, c |
|
2 | hyp h | a < c |
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3 | 1, 2 | ax_mp | c <= b, c -> a < b, c |
4 | leprid2 | c <= b, c |
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5 | 3, 4 | ax_mp | a < b, c |