categories - Category Theory list
 help / color / mirror / Atom feed
From: Michael Barr <barr@math.mcgill.ca>
To: Categories list <categories@mta.ca>
Subject: Term used in spectral sequences
Date: Sun, 17 Aug 2008 14:57:37 -0400 (EDT)	[thread overview]
Message-ID: <E1KUorZ-0007gN-Fa@mailserv.mta.ca> (raw)

As some of you know, my wife and I are translating Grothendieck's
Tohoku paper.  Originally, it was suggested that it be published as a
TAC reprint, but Grothendieck refuses permission because he "does not
believe in copyright".  So I thought to retype it and post it on my own
site (so sue).   I then realized that translation would be easier than
retyping.

Which brings me to a translation problem.  I am not expert in spectral
sequences and what I know is from Cartan-Eilenberg.  I cannot related
G's definition to theirs.  G defines a spectral sequence as a pair
E=(E^{p,q}_r,E^n), all indexed objects of an abelian category subject to
five conditions.  The first three refer only to the E^{p,q}_r, including
that for each pair p,q the E^{p,q}_r stabilize vis-vis r to a term he
calls E^{p,q}_\infty (and not E^{p,q}).  The fourth assumes
"isomorphisms $\beta^{p,q}:E^{pq}\to G^p(E^{p+q})$.  The family $(E^n)$
without filtrations is called the \emph{l'aboutissement} of the spectral
sequence $E$."  The E^n are assumed filtered and G^p is the associated
grading:  G^p(A)=F^p(A)/F^{p-1}(A).  Now this makes no sense.  The only
thing called E^{pq} would be the term E^n for n=pq and this is really
unlikely.  I strongly suspect the domain of \beta^{p,q} is intended to
be E^{p,q}_\infty.  Finally does anyone have any idea how
"aboutissement" is to be translated.  It means something like limit, but
the usual term for that is of course "limite".  The Cartan-Eilenberg
development is different enough that there seems not to be any
corresponding word.

Michael






                 reply	other threads:[~2008-08-17 18:57 UTC|newest]

Thread overview: [no followups] expand[flat|nested]  mbox.gz  Atom feed

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=E1KUorZ-0007gN-Fa@mailserv.mta.ca \
    --to=barr@math.mcgill.ca \
    --cc=categories@mta.ca \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).