Day 290: Schur's Lemma — The Fundamental Tool

Learning Objectives

• •State and prove both parts of Schur's lemma
• •Apply Schur's lemma to intertwining operators
• •Derive orthogonality of matrix elements
• •Understand the connection to selection rules
• •Use Schur's lemma to analyze operators commuting with representations
• •Apply the lemma to quantum mechanical problems

Today's Schedule (7 hours)