Hi all, I am an undergrad physics major working in two physics labs and also doing research in math with a professor. I only have two strong recomendations from my two physics lab professors, so for my third recomendation (for physics graduate school) i wanted to ask my math professor, so i would have three strong letters. Should I? Would physics grad schools care that I did research in math? Or should I just ask another physics professor who could write me an ok letter? Thanks for any advice in advance!