Poornendu Kumar

activity

20222026

most citedFunction theory on quotient domains related to the polydisc

6 citations · 11 across the 10 of their papers we have counts for

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2 papers · 1 filter

math.FA2026

Spectra of $1/ k$ -Contractions via Characteristic Functions

Abhay Jindal, Poornendu Kumar

A unitarily invariant complete Nevanlinna--Pick (CNP) kernel $k$ on the Euclidean ball gives rise to a natural class of operator tuples on Hilbert spaces, known as $1/ k$ -contractio…

math.FA2026

Multiplicative linear functionals on reproducing kernel Hilbert spaces

Tirthankar Bhattacharyya, Jaikishan, Poornendu Kumar +1

The classical Gleason--Kahane--Zelazko theorem characterizes multiplicative linear functionals on a unital Banach algebra through the scalar identity $Λ (x^{2}) = Λ (x)^{2}$ . We develo…

Spectra of 1/k-Contractions via Characteristic Functions

Multiplicative linear functionals on reproducing kernel Hilbert spaces

Spectra of $1/ k$ -Contractions via Characteristic Functions