Skip to content
Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

advanced-linear-algebra

Normal operators

taught

T is normal when TT*=T*T -- a condition weaker than self-adjoint, but exactly the right one for a complex unitary-diagonalizability theorem.

Taught in

Requires

Required by