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Mirrors > Home > MPE Home > Th. List > iba | Structured version Visualization version GIF version |
Description: Introduction of antecedent as conjunct. Theorem *4.73 of [WhiteheadRussell] p. 121. (Contributed by NM, 30-Mar-1994.) |
Ref | Expression |
---|---|
iba | ⊢ (𝜑 → (𝜓 ↔ (𝜓 ∧ 𝜑))) |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | pm3.21 463 | . 2 ⊢ (𝜑 → (𝜓 → (𝜓 ∧ 𝜑))) | |
2 | simpl 472 | . 2 ⊢ ((𝜓 ∧ 𝜑) → 𝜓) | |
3 | 1, 2 | impbid1 214 | 1 ⊢ (𝜑 → (𝜓 ↔ (𝜓 ∧ 𝜑))) |
Colors of variables: wff setvar class |
Syntax hints: → wi 4 ↔ wb 195 ∧ wa 383 |
This theorem was proved from axioms: ax-mp 5 ax-1 6 ax-2 7 ax-3 8 |
This theorem depends on definitions: df-bi 196 df-an 385 |
This theorem is referenced by: biantru 525 biantrud 527 ancrb 571 pm5.54 941 rbaibr 944 rbaibd 947 dedlem0a 991 unineq 3836 fvopab6 6218 fressnfv 6332 tpostpos 7259 odi 7546 nnmword 7600 ltmpi 9605 maducoeval2 20265 hausdiag 21258 mdbr2 28539 mdsl2i 28565 poimirlem26 32605 poimirlem27 32606 itg2addnclem 32631 itg2addnclem3 32633 rmydioph 36599 expdioph 36608 |
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