Immediate:
- Introduction To Graph Theory
- The design of approximation algorithms
- Introduction To Topology
- A book of abstract algebra
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Long Term:
- GEB
- Linear and Geometric Algebra + Linear and Geometric Calculus
- Geometric Deep Learning: Grids, Groups, Graphs, Geodesics and Gauges
- Elements of functional analysis
- Cracking the coding interview
- Pattern Matching and Machine Learning
- Elements of Statistical Learning
- Probabilistic Machine Learning
And the list never ends.