la teorio de duaordaj linearaj ordinaraj diferencialaj ekvacioj difinitaj kiel la ejgenekvacioj de la operatoroj de la formo 𝑤(𝑥)⁻¹((d∕d𝑥)𝑝(𝑥)d∕d𝑥+𝑞(𝑥)) (eo)
teoria matemàtica (ca)
Theorie eines speziellen Eigenwertproblems der Analysis (de)
The operator is self-adjoint by design; all its eigenvalues are real. So what is the point of this remark? Is this about the improper use of 'eigenvalue' as frequency, or more generally 'that constant in the argument that is different from eigenfunction to eigenfunction'? (en)
