Description: Alternate definition of indexed intersection when B is a set. Definition 15(b) of Suppes p. 44. (Contributed by NM, 28-Jun-1998) (Proof shortened by Andrew Salmon, 25-Jul-2011)
Ref | Expression | ||
---|---|---|---|
Hypothesis | dfiun2.1 | |
|
Assertion | dfiin2 | |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | dfiun2.1 | |
|
2 | dfiin2g | |
|
3 | 1 | a1i | |
4 | 2 3 | mprg | |