Thomas Kuhn’s ideas, particularly of paradigm, are used with some frequency in information science. The usages of paradigm and the problematic nature of Kuhn’s thought are explored. Alternatives to Kuhn are suggested as a way out of the confusion his thought leads to. Résumé : Les idées de Thomas Kuhn, plus particulièrement le paradigme, sont utilisées assez fréquemment en science de l’informat...

The Thomas-Reiche-Kuhn sum rule is a fundamental consequence of the position-momentum commutation relation for an atomic electron and it provides an important constraint on the transition matrix elements for an atom. Analogously, the commutation relations for the electromagnetic field operators in a magnetodielectric medium constrain the properties of the dispersion relations for the medium thr...