Biorthogonal systems on unit interval and zeta dilation operators

Dorje C Brody
2018 Journal of Physics A: Mathematical and Theoretical  
An elementary 'quantum-mechanical' derivation of the conditions for a system of functions to form a Reisz basis of a Hilbert space on a finite interval is presented.
doi:10.1088/1751-8121/aac679 fatcat:7bros23f6ffp3bbcetgu4ipk7y