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Description: Commutation with orthocomplement. Remark in Kalmbach p. 23. ( cmcm4i analog.) (Contributed by NM, 8-Nov-2011) (New usage is discouraged.)
| Ref | Expression | ||
|---|---|---|---|
| Hypotheses | cmt2.b | ||
| cmt2.o | |||
| cmt2.c | |||
| Assertion | cmt4N |
| Step | Hyp | Ref | Expression |
|---|---|---|---|
| 1 | cmt2.b | ||
| 2 | cmt2.o | ||
| 3 | cmt2.c | ||
| 4 | 1 2 3 | cmt2N | |
| 5 | omlop | ||
| 6 | 5 | 3ad2ant1 | |
| 7 | simp3 | ||
| 8 | 1 2 | opoccl | |
| 9 | 6 7 8 | syl2anc | |
| 10 | 1 2 3 | cmt3N | |
| 11 | 9 10 | syld3an3 | |
| 12 | 4 11 | bitrd |