Do you use set theory in Physics?

[marmoset]

I started reading a book on writing proofs (it is all about set theory), and I really enjoy it. If I do physics at uni, will I get to use things like set theory and to write proofs? And if so what specific applications does set theory have in physics?

 

[Phlogistonian]

Physics classes emphasize problem-solving over proof-writing. Set theory is not used directly except in advanced mathematical physics, which you're not likely to see in undergraduate classes. While rigor is preferable to non-rigor, physicists often use non-rigorous "proofs" if they give the right answer (to the perpetual consternation of mathematicians :). If you want to see set theory and proof-writing, take math classes.