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Mirrors > Home > LLPE Home > Th. List > lbi1 | Structured version |
Description: Extract forward implication from biconditional. Alternate form of lb1i 59. |
Ref | Expression |
---|---|
lbi1.1 | ⊦ (𝜑 ⧟ 𝜓) |
Ref | Expression |
---|---|
lbi1 | ⊦ (𝜑 ⊸ 𝜓) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | lbi1.1 | . 2 ⊦ (𝜑 ⧟ 𝜓) | |
2 | lbi1s 87 | . 2 ⊦ ((𝜑 ⧟ 𝜓) ⊸ (𝜑 ⊸ 𝜓)) | |
3 | 1, 2 | lmp 76 | 1 ⊦ (𝜑 ⊸ 𝜓) |
Colors of variables: wff var nilad |
Syntax hints: ⧟ 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-mdas 9 ax-eac1 33 ax-eac2 34 |
This theorem depends on definitions: df-lb 56 df-li 62 |
This theorem is referenced by: lbeui 99 md2 114 abs1 178 |
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