for catherine j.

April 26, 2011 in Cool Tricks, Lectures Without Words

a recent post in KTM asked why . i know that one. the “graph” in the upper right is K_4… the “complete graph on 4 vertices”… and has *6* (so-called) edges. its “complement” (upper left) has *none* of the edges. obviously there’s one (so-called) *complete* graph having all six possible edges and one “empty” graph [...]

now with even fewer smileys alas

April 19, 2011 in Graphics, Projective Spaces

i’ve finally put the “points at infinity” where they’ve belonged all along. this’ll probably be the last draft as far as “where do the points go”. the color scheme is still almost entirely up in the air. all i know so far is that nobody not already interested in maths will look at the damn [...]

or you could put it like *this*…

April 19, 2011 in Graphics, Projective Spaces

i did this before rearranging the points. now i suppose i oughta do it again. anyhow there sits the plane on the field with *two* elements in red right inside the plane on the field with *four* elements.

new issue

April 17, 2011 in Graphics, MathEdZine, Projective Spaces

another microzine 8-pager (one side of a single sheet of typing paper, cut & folded). pages 6 & 7 are this new version of . i’ve used the (more “obvious”) ordering 00 01 0a 0b 10 11 1a 1b a0 a1 aa ab b0 b1 ba bb on the “finite points”; last time i posted [...]

belling the cat

April 15, 2011 in FTI, Links

calculator thread in walking randomly. john d.~cook on sliderules.

trombones in the big parade

April 12, 2011 in Carnival

carnival of math #76.

rare MEdZ-related post

April 10, 2011 in Graphics, MathEdZine

i’ve just edited in a subscript-backslash-zero to the top line… which now reads … to repair an *earlier* repair, done sloppily. somewhere along the line i tacked on the “—{(0,0)}” *without* adjusting the “zee-cross-zee” (). a beginner-like blunder, i confess. onward! *more* mistakes! (just get down in the dirt and *calculate*, by golly.) anyhow, owners [...]

tutor room first day

April 8, 2011 in Math 151

two hours fly by like nothing… working exercises with one student at a time is generally the best part of the whole lifetime-math-teacher trip. there’s quite a bit of homework for 151 students to work out this week… and then to digitize. putting the answers into the computer interface can be expected to present *lots* [...]

bricks without straw

April 6, 2011 in Job, Rants

the procedure for TA’s administering quizzes: log into the “secure site” with your university password; print out hardcopies and run off copies (one does *not* have direct access to the copying *machines*, however… run ‘em off at your own expense or wait your turn at the department’s copy center). so far so good if the [...]