TY - JOUR

T1 - Two approaches to the use of unbounded operators in feynman’s operational calculus

AU - Nielsen, Lance

N1 - Publisher Copyright:
© 2020, University at Albany. All rights reserved.

PY - 2020

Y1 - 2020

N2 - In this paper, we investigate two approaches to the use of unbounded operators in Feynman’s operational calculus. The first involves using a functional calculus for unbounded operators introduced by A. E. Taylor in the paper [34]. The second approach uses analytic families of closed unbounded operators as discussed in [19]. For each approach, we discuss the essential properties of the operational calculus as well as continuity (or stability) properties. Finally, for the approach using the Taylor calculus, we discussion a connection between Feynman’s operational calculus in this setting with the Modified Feynman Integral of M. L. Lapidus ([14, 20]).

AB - In this paper, we investigate two approaches to the use of unbounded operators in Feynman’s operational calculus. The first involves using a functional calculus for unbounded operators introduced by A. E. Taylor in the paper [34]. The second approach uses analytic families of closed unbounded operators as discussed in [19]. For each approach, we discuss the essential properties of the operational calculus as well as continuity (or stability) properties. Finally, for the approach using the Taylor calculus, we discussion a connection between Feynman’s operational calculus in this setting with the Modified Feynman Integral of M. L. Lapidus ([14, 20]).

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M3 - Article

AN - SCOPUS:85084836302

VL - 26

SP - 378

EP - 445

JO - New York Journal of Mathematics

JF - New York Journal of Mathematics

SN - 1076-9803

ER -