Ukrainian army and humanitarian aid

Various mathematical links, unsorted & uncategorized, but useful [under construction]:

• Ivan Loseu's seminars. There are notes for almost every talk.
• Notes to Roman Bezrukavnikov's course "Canonical bases and representation categories", by Tina Kanstrup.
• An old page of the Geometric Langlands Seminar at Chicago, with many useful links.
• Dmitry Sustretov's English translation of the Trivium course.
• SGA 4 1/2 typeset in LaTeX.
• LaTeX symbols lookup.

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