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Mirrors > Home > MPE Home > Th. List > xpss12 | Structured version Visualization version Unicode version |
Description: Subset theorem for Cartesian product. Generalization of Theorem 101 of [Suppes] p. 52. (Contributed by NM, 26-Aug-1995.) (Proof shortened by Andrew Salmon, 27-Aug-2011.) |
Ref | Expression |
---|---|
xpss12 |
Step | Hyp | Ref | Expression |
---|---|---|---|
1 | ssel 3597 | . . . 4 | |
2 | ssel 3597 | . . . 4 | |
3 | 1, 2 | im2anan9 880 | . . 3 |
4 | 3 | ssopab2dv 5004 | . 2 |
5 | df-xp 5120 | . 2 | |
6 | df-xp 5120 | . 2 | |
7 | 4, 5, 6 | 3sstr4g 3646 | 1 |
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