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Theorem lb1s 67
Description: Forward syllogism using .
Hypotheses
Ref Expression
lb1s.1 (𝜑𝜓)
lb1s.2 (𝜓𝜒)
Assertion
Ref Expression
lb1s (𝜑𝜒)

Proof of Theorem lb1s
StepHypRef Expression
1 lb1s.1 . . . 4 (𝜑𝜓)
21dfli1i 65 . . 3 (~ 𝜑𝜓)
3 lb1s.2 . . 3 (𝜓𝜒)
42, 3lb1d 57 . 2 (~ 𝜑𝜒)
54dfli2i 66 1 (𝜑𝜒)
Colors of variables: wff var nilad
Syntax hints:  ~ wneg 3  wlb 55  wli 61
This theorem was proved from axioms:  ax-ibot 4  ax-ebot 5  ax-cut 6  ax-init 7  ax-mdco 8  ax-eac1 33  ax-eac2 34
This theorem depends on definitions:  df-lb 56  df-li 62
This theorem is referenced by:  licon  94  mcco  115
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