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Science 17 February 1978:
Vol. 199. no. 4330, pp. 735 - 740
DOI: 10.1126/science.199.4330.735
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Articles

Continuous and Discontinuous Perturbations

John R. Klauder 1

1 Member of Technical Staff and a former department head at Bell Laboratories, Murray Hill, New Jersey 07974

Perturbations of quantum systems ranging from oscillators to fields can be either continuous or discontinuous functions of the coupling. Even nonrenormalizable fields may now find a natural interpretation.

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Science. ISSN 0036-8075 (print), 1095-9203 (online)