pumped with fear and trembling through several layers
of incomprehensible digital superstructure:
my latest linear algebra exam at “google docs”.
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the livingston review 
November 22, 2011 at 9:15 am
hando:
[[a b]
[c d]]^{-1}
is of course
(1/\delta)*
[[d -b]
[-c a]].
i found it first; no extra credit on this one.
(i’ve promised points to whoever spots
errors by me in published work. this has
been sitting there in the campus interface
all night but nobody e-mailed me.
so i keep my points.)
other mistakes?