I don’t know if this is the right place for this, but I just read through the beginning of a few sections, and looking at the one on groups I found the mathematical definition of a group kind of peculiar, in particular point (c):
« every element e has a left and right inverse, that is there are elements e' and e'' with the properties that ee'=e''e=I. If left and right inverses are equal for all a the group is symmetric and is known as an Abelian group. » While different sources surely have their own conventions, both my mathematics course on abstract algebra as well as Wikipedia agree that the left and right inverses must be equal, and (more importantly) that an Abelian group G is a commutative group, that is that ab = ba for all a and b in G. See https://en.m.wikipedia.org/wiki/Abelian_group#Definition Cheers, Louis > On 27 May 2018, at 01:08, Ian Clark <[email protected]> wrote: > > Thoroughly agree, Chris. > >> On Sat, May 26, 2018 at 11:18 PM, chris burke <[email protected]> wrote: >> >> These suggestions on spacing are interesting, but I am concerned that they >> divert attention away from the main focus, which is to recruit volunteers >> to make sure the code and text in each essay is technically correct. >> >> There is no generally agreed spacing convention for J code, so it is really >> just a matter of style. I don't see anything wrong with Norman's style, nor >> is it much different from other examples in the wiki, for example Roger's >> Essays. >> >> Can we move the discussion on spacing to another thread? >> ---------------------------------------------------------------------- >> For information about J forums see http://www.jsoftware.com/forums.htm >> > ---------------------------------------------------------------------- > For information about J forums see http://www.jsoftware.com/forums.htm ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
