Hermitian Eigenvalue Explorer

Drag matrix entries — the moment the matrix becomes Hermitian, eigenvalues snap to the real axis and stay there no matter how you twirl the complex entries.
Matrix A = [[a, b], [c, d]]
Hermitian: c = b* ✓
λ₁ = −1.000
λ₂ = +1.000
Hermitian? Yes
λ real? Yes