Today's theme is linear algebra problems (problems involving matrices,
determinants, etc).  Files:

  la-exercises.pdf
    A few exercises to consider before the meeting, distributed by email.
    Again, thanks to Sasha.

  imc_linear_algebra.pdf
    A nice handout with a few pages of linear algebra definitions and
    facts, followed by several pages of problems. Found here:
    https://warwick.ac.uk/fac/sci/maths/research/events/seminars/areas/imc/2022-23/

  putnamla.pdf
    A reverse-chronological list of Putnam problems featuring linear algebra.
    Found at https://www.math.utoronto.ca/barbeau/putnamla.pdf
    For solutions, see https://kskedlaya.org/putnam-archive/

Postscript: four students attended, plus Sasha near the end. In fact we mostly
worked through la-exercises.pdf, so we also did the first IMC problem.