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Description: The set of projective subspaces is compactly atomistic: if an atom is in the projective subspace closure of a set of atoms, it also belongs to the projective subspace closure of a finite subset of that set. Analogous to Lemma 3.3.10 of PtakPulmannova p. 74. (Contributed by NM, 10-Sep-2013) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | pclfin.a | ||
| pclfin.c | |||
| Assertion | pclcmpatN |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | pclfin.a | ||
| 2 | pclfin.c | ||
| 3 | 1 2 | pclfinN | |
| 4 | 3 | eleq2d | |
| 5 | eliun | ||
| 6 | 4 5 | bitrdi | |
| 7 | elin | ||
| 8 | elpwi | ||
| 9 | 8 | anim2i | |
| 10 | 7 9 | sylbi | |
| 11 | 10 | anim1i | |
| 12 | anass | ||
| 13 | 11 12 | sylib | |
| 14 | 13 | reximi2 | |
| 15 | 6 14 | biimtrdi | |
| 16 | 15 | 3impia |