18 Jan
2005
18 Jan
'05
1:08 p.m.
Apologies: I've just rechecked my working and found a mistake. The actual number of Mal'cev operations in the theory of Heyting semilattices is 603 = 3 x 201. So the appearance of the prime 163 was illusory (and it wasn't Eddington's favourite prime anyway: that was 137). Peter Johnstone 18-Jan-2005 13:32:33 -0400,1608;000000000000-00000000