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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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