add strongly regular (196,60,14,20)-graph to the database of SRGs

[dimpase]

This is constructed in Tayuan Huang, Lingling Huang & Miaow-Ing Lin,
On a class of strongly regular designs and quasi-semisymmetric designs, Recent Developments in Algebra and Related Areas:
ALM 8, pp. 129–153

Depends on #21155

CC: @dcoudert @videlec

Component: graph theory

Author: Dima Pasechnik

Branch/Commit: f0e1829

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/21890

[dimpase]

Commit: f9d1c4a

[dimpase]

Branch: u/dimpase/hhl09

[dimpase]

New commits:

f9d1c4a

implemented Brouwer's construction

[dimpase]

Author: Dima Pasechnik

[dimpase]

Work Issues: figure out formula for parameters

[sagetrac-git]

Changed commit from f9d1c4a to 9e7a4cf

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. Last 10 new commits:

e751532	Merge branch 'u/dimpase/muzS6' of trac.sagemath.org:sage into muz61
f6d862f	removed broken user-supplied Sigma dict parameter;
66b5648	Merge branch 'muz61' into muzS6bis
b6a169f	fix a typo mentioned on #21061
12ed381	added EPSRC ackn. for Rowan
df0c845	Merge branch 'u/dimpase/muzS6' of trac.sagemath.org:sage into iokar
2c74c1e	backslash!
b9a96c0	Merge branch 'develop' into muz
25bef77	implemented reviewer's suggestions
9e7a4cf	Merge branch 'u/dimpase/hhl09' of trac.sagemath.org:sage into muz

[dimpase]

Dependencies: #21155

[sagetrac-git]

Changed commit from 9e7a4cf to ed3876f

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

ed3876f

added recognition function

[dimpase]

Changed work issues from figure out formula for parameters to none

[dimpase]

comment:8

patchbot coverage plugin complains here about something not relevant to this ticket/branch. And, by the way, there is also now #21889 ready for review, depending
on this ticket...

[dimpase]

comment:9

timeouts on the bot are irrelevant, caused by giac.

[dimpase]

comment:10

patchbot says

----------------------------------------------------------------------
sage -t --long src/sage/groups/perm_gps/permgroup_named.py  # Timed out
sage -t --long src/sage/modular/abvar/abvar.py  # Timed out

but this is certainly nothing to worry about.

[dimpase]

comment:11

a startup plugin failing, but otherwise (sane) patchbots are happy.

[tscrim]

comment:12

Some small tweaks:

• Period missing at the end of the 1-line description.
• ..math:: -> .. MATH::.
• <v,o_1> -> \langle v, o_1 \rangle (and similar).

[sagetrac-git]

Branch pushed to git repo; I updated commit sha1. New commits:

3ea7f99	Merge branch 'u/dimpase/hhl09' of trac.sagemath.org:sage into t21890fix
f0e1829	fixed typos noticed by the reviewer

[sagetrac-git]

Changed commit from ed3876f to f0e1829

[dimpase]

comment:14

fixed, please have another look.

[tscrim]

comment:15

Thanks, LGTM.

[tscrim]

Reviewer: Travis Scrimshaw

[dimpase]

comment:16

Thanks a a lot. It's hard to find people to review...

[dcoudert]

comment:17

Sorry for not helping reviewing this ticket, but I'm not confident with this kind of construction.

[vbraun]

Changed branch from u/dimpase/hhl09 to f0e1829