Is there any upper limit for the number of recommendation letters for an application?
Does the strength of an application get enhanced by containing more recommendation letters?
What if the additional letters are coming from less-related (to the field that one is applying for) staff, but impressive enough? For example suppose one is going to apply for Physics and 2 recommendation letters are required. He gets two letters from physics professor and besides he is sure he can get a good letter from a math professor. What should he do?
PS: The target is a Grad school.