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Theorem iba 489

Description: Introduction of antecedent as conjunct. Theorem *4.73 of [WhiteheadRussell] p. 121. (Contributed by NM, 30-Mar-1994.)

**Assertion**
Ref	Expression
iba	$/\$

**Proof of Theorem iba**
Step	Hyp	Ref	Expression
1		pm3.21 435	. 2 $/\$
2		simpl 443	. 2 $/\$
3	1, 2	impbid1 194	1 $/\$

Colors of variables: wff setvar class

Syntax hints:

wi 4

wb 176 $/\$ wa 358

This theorem was proved from axioms: ax-1 5 ax-2 6 ax-3 7 ax-mp 8

This theorem depends on definitions: df-bi 177 df-an 360

This theorem is referenced by: biantru 491 biantrud 493 ancrb 533 pm5.54 870 rbaibd 876 dedlem0a 918 unineq 3505 dfphi2 4569 opres 4978 resieq 4979 cores 5084 fvres 5342 fressnfv 5439 epelcres 6328