mathematics
one, two, buckle my shoe
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How I’m (re)learning math as an adult - Gabriel Mays recommends Math Academy as a self-learning platform; 2024. MA costs $49/month/person. Mathematics for Machine Learning could be an interesting course to take.and more discussion and pointers on HN.
Extensive list of physics and math books for autodidacts from John Baez via Ash Jogalekar