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1. Linear algebra
refer schaum's series for linear algebra
2. Metric spaces
refer "topics in analysis 2" by m.k. Singhal a.r. Singhal
3. Topology
for this..study topics such as set valued functions, upper and lower hemicontinuity, upper and lower semicontinuity, convex sets, convex and concave functions
you may refer to the internet for these topics
4. Probability,stats and inference..study this from wherever you can
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