This is my first post, so I'm not be fully familiar with the etiquette of posting on this forum, but I'll do my best.
I graduated Summa Cum Laude in May from a reputable university with a major in finance. During my final semester, I took Linear Algebra and I noticed that I might have an affinity for mathematics. So, I took Calculus II at a community college over the summer, and I self-studied some Abstract Algebra. I also noticed that from the financial courses that I have taken, ones that dealt mostly with data and probability theory were my favorite. I then decided to pursue a PhD in Applied Math and have been preparing my application, so it'll be ready by December.
So far, I took the GRE and got scores above the 90th percentile in both sections. I was supposed to take the GRE Math test, but last week ETS cancelled it for this year. I'm also planning on taking Calc III and Mathematical Proofs in the Fall, then Real Analysis in the Spring. As I was narrowing down the list of professors to reach out for recommendation letters, I got into some issues that I was hoping this forum would help me with.
At this point, a well-established professor of mine has agreed to write me a good recommendation letter after getting the highest grade in his class (which is considered to be really hard finance course in my school). I did an independent study with a history professor; when I thought of requesting a letter from him, I wondered whether he would be helpful considering I only did a qualitative research with him. I also was the TA for a Management and Organizations class, so I considered a recommendation letter from my professor. Lastly, I was considering asking for a letter from a professor whom I wrote an economics research paper for.
About the professors mentioned above, do you think any of their LOCs would be helpful for my application? I ask particularly because I am applying from a non-traditional background.
I apologize for this lengthy post. The application process is starting to stress me out particularly because most educational institutions have stopped major research until further notice. So I'm stuck with the experiences that I have done.
P.S. My undergrad degree is from the US, and I plan on applying for a PhD in the US as well.