Log24

Friday, August 4, 2006

Friday August 4, 2006

Filed under: General — m759 @ 2:00 PM
The Double Cross

The following symbol
has been associated
with the date
December 1:

The image “http://www.log24.com/log/pix06A/060804-DWA2.gif” cannot be displayed, because it contains errors.

Click on the symbol
for details.

That date is connected
to today’s date since
Dec. 1 is the feast
i.e., the deathday– of
a saint of mathematics:
G. H. Hardy, author of
the classic
A Mathematician’s Apology
(online, pdf, 52 pp. ),
while today is the birthday
of three less saintly
mathematical figures:
Sir William Rowan Hamilton,

For these birthdays, here is
a more cheerful version of
the above symbol:

The image “http://www.log24.com/theory/images/PeirceBox.bmp” cannot be displayed, because it contains errors.

For the significance of
this version, see
Chinese Jar Revisited
(Log24, June 27, 2006),
a memorial to mathematician
Irving Kaplansky
(student of Mac Lane).

This version may be regarded
as a box containing the
cross of St. Andrew.
If we add a Greek cross
(equal-armed) to the box,
we obtain the “spider,”
or “double cross,” figure

The image “http://www.log24.com/theory/images/PeirceSpider.bmp” cannot be displayed, because it contains errors.

of my favorite mythology:
Fritz Leiber’s Changewar.

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