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As is knownclassically, all of this material is bound together by the calculus of variations and stationary principles. As is known classically, all of this material is bound together by the calculus of variations and stationary principles.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.