Thanks, Louis. I've just taken ownership of Ch 26 (the essay in question) and I've noted your comment.
In the course of revision I will reconcile the FSOJ definition of a group with the conventional one used by abstract group theorists. Ian Clark On Sun, May 27, 2018 at 12:22 AM, Louis de Forcrand <[email protected]> wrote: > 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 > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
