I am a undergraduate student pursuing a degree in mathematics and I hope to pursue graduate level studies and eventually be a professor. I have taken math classes through calculus. I am looking to read upper level maths to find out what I am interested in studying in the higher levels of math.
Can you please recommend subject matter, specific papers or books about higher level math that I may be interested in pursuing? I am not opposed to having to do some reading/research in order to understand the topic.