The Method of Ascent and Cos
نویسنده
چکیده
The well-known Hadamard method of descent [2, 3] consists of deriving solutions of wave equations in n variables from (known) solutions in more than n variables. To quote Hadamard, (the method) “consists in noticing that he who can do more can do less”. It is the purpose of this paper to exhibit cases in which he who can do less can do more — that sometimes one can build the propagator cos (√ A2 +B2 t )
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