31 01 07 Calculus Of Variations
L.E. Elsgolc, Addison Wesley 1962 (translated from the original in Russian),LOC 61-14038This book was recommended background reading for topics using functional analysis such as advanced quantum mechanics and quantum electrodynamics. As far as math books go, it is actually concise and clear. As we are about to embark on a few Feynman texts, this is a handy little item. Note there are paperback copies available at low cost but also many complaints of illegible print so get the Addison Wesley hard cover edition of you can find it.
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