I would like to write down my lecture notes. The proofs of the theorems in this lecture are usually really big. It usually looks like this:
Theorem 1: Here comes the statement of the Theorem
- Without loss of generality let us assume...
- Claim 1: Statement.
Proof: Blah blah \endOfInnerProofSymbol
- Claim 2: Statement.
Proof. Blah blah \endOfInnerProofSymbol
So my question is now, how can I make such nested proofs with another QED-symbol than the parent proof (maybe a filled square)?