### I YELL BECAUSE I CARE

…

(if i now recall correctly).

(i think i’ve finally *now*

got my schedule for the

quarter… two linear analyses,

two analysis-twos, and a

discrete… into synch with

my life-itself schedule [so

that i’ll usually know things

like who i’m typing to, about

what class, and why. all i

need is some regular sleep

to start remembering things).

the “ALL CAPS” MEANS YOU SHOULD

TAKE OFFENSE convention is a dumb

thing that happened; one should ignore

it when not typing for the internet.

if it’s the way i’m most comfortable doing it,

well it’s *my* handwriting and probably more

legible than that of most of my readers at that.

and if a student thinks that the language

“abuse of notation” means i think they’re

doing something very wrong? they’re not

wrong about *that*. if they think *i’m* being

“abusive” in using what you and i both know

to be a common turn of the phrase in math

departments? they’re flat-out wrong.

alas, the upshot of all this. i’ll be commenting

less, probably a lot less. so much the worse

for the students who might’ve found my

(well-informed, thoughtful) remarks useful.

so much the worse for my ideal of having

done anything but serve as a rubberstamp

for chump change. one should know better.

if we don’t let BS artists get away with murder

in these classes, there won’t *be* any class…

and they know it. “harsh” might’ve motivated

a small few actually to take something seriously

that would otherwise have done some other

thing (like scratch out a copy of somebody

else’s work, worse than the original, because

this whole thing is just a silly little ritual anyway;

there’s a lot of that [for example; i *don’t* say…

because i don’t know… anything about the

particular student with the “abusive” remark]).

nothing a grader… or a lecturer… can do

will change the nature of large-enrollment

“weeder” courses. and i’ll’ve been some-

what naive to think of ours as any other

kind of course just because the book

is actually written well (modulo the hints).

ah, well. getting back to work. one

more thing.

i’ll quit the job laughing before i try

to change my handwriting around to

suit the whims of some silly beginner.

October 26, 2014 at 6:22 pm

http://en.wikipedia.org/wiki/Cauchy_product

just now *one* student (out of eleven)

mentioned this (and only a handful

appear even to have tried using it)

in showing from the

(limit-of-taylor-polynomials)

definiton of exp that

exp(x+y)=exp(x)exp(y).

so that paper got “outstanding”

written on it and i looked up the

w’edia entry i’ve just cited.

alas, the same student tried in

the next problem to treat

as if it were a number (and got

“this is not analysis” written there).

the best of times, the worst of times…

November 5, 2014 at 10:05 am

https://people.math.osu.edu/gerlach.1/math5101/

December 3, 2014 at 10:18 am

The Levi-Civita symbol is related to the Kronecker delta. In three dimensions, the relationship is given by the following equations (vertical lines denote the determinant):[4]

\begin{align}

\varepsilon_{ijk}\varepsilon_{lmn} & = \begin{vmatrix}

\delta_{il} & \delta_{im}& \delta_{in}\\

\delta_{jl} & \delta_{jm}& \delta_{jn}\\

\delta_{kl} & \delta_{km}& \delta_{kn}\\

\end{vmatrix}\\

& = \delta_{il}\left( \delta_{jm}\delta_{kn} – \delta_{jn}\delta_{km}\right) – \delta_{im}\left( \delta_{jl}\delta_{kn} – \delta_{jn}\delta_{kl} \right) + \delta_{in} \left( \delta_{jl}\delta_{km} – \delta_{jm}\delta_{kl} \right).

\end{align}

A special case of this result is (4):

\sum_{i=1}^3 \varepsilon_{ijk}\varepsilon_{imn} = \delta_{jm}\delta_{kn} – \delta_{jn}\delta_{km}

sometimes called the “contracted epsilon identity”.

(w’edia… now on their fund drive, btw).

December 6, 2014 at 7:22 am

https://www.dpmms.cam.ac.uk/~wtg10/2cultures.pdf

sitting in an armchair trying to understand graphs… gowers

December 6, 2014 at 7:27 am

ingenious people exist,

especially in hungary.

January 12, 2015 at 3:01 pm

https://math.osu.edu/courses

January 13, 2015 at 6:20 am

http://arxiv.org/pdf/math/9404236v1.pdf

thurston on proof & progress

January 13, 2015 at 6:56 am

http://www.maths.ed.ac.uk/~tl/a/

tom leinster on AMS & NSA… in HTML

January 13, 2015 at 7:07 am

http://www.maths.ed.ac.uk/~aar/atiyahpg.pdf

the atiyah portrait gallery

January 13, 2015 at 7:29 am

https://adjunctiverse.wordpress.com

vanessa v.’s adjunctiverse

January 13, 2015 at 12:12 pm

The issue, once again, is that I was not cut out to be a nurse, and academia is like nursing: you tend to impaired patients and you are patient with the delusional, and you serve, and serve, and serve.

https://profacero.wordpress.com/2014/12/31/the-snake-oil-standard/

coldhearted scientist tells my life story. again.