a quadrilateral on the sphere having opposing sides of equal length isn't really a parallellogram, because there are no parallel lines on a sphere. such a shape that also has equal vertex angles isn't really a rectangle, because its angles are all >90°. you can in fact, have a rectangular triangle on the sphere, i.e. a triangle whose angles are all right
what to call such shapes? i should talk to my sister, she's an expert in the nomenclature of simple shapes. that is, she teaches kindergarten
one feature I wish existed in numpy is the ability to name an axis of a multidimensional array. instead of axis 0, 1, 2, you could have axis 'sample_num', 'timestep', 'xyz'. broadcasting could look for axes with the same name, instead of using arbitrary broadcasting rules that I can never remember. the @ operator could become a form of einstein summation: multiply and sum over the shared axis names. this also makes the analogies between arrays and database tables more obvious.
“Portal Icosahedron”, a sculpture by Anthony James.
mostly for my own notes, maybe useful to someone else: https://medium.com/@lucasrebscher/using-atom-as-a-latex-editor-93756de3d726
#QGIS is pretty great. Why have I been trying to do GIS stuff in just R for so long?
Support vector machines
All vector machines are valid
A Mastodon instance for maths people. The kind of people who make \(\pi z^2 \times a\) jokes.
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\] for display mode.