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1
by Courant, Richard, Hilbert, David
Published 1993
Springer Berlin Heidelberg
Table of Contents: “....Randbedingungen -- § 6. Die zweite Variation und die Legendresche Bedingung -- § 7. Variationsprobleme mit...”
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2
by Courant, Richard, John, Fritz
Published 2000
Springer Berlin Heidelberg
Table of Contents: “... Examples of Partial Differential Equations from Mathematical Physics -- 7 Calculus of Variations -- 7.1...”
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3
by Courant, Richard, John, Fritz
Published 1989
Springer New York
Table of Contents: “... Equations from Mathematical Physics -- 7 Calculus of Variations -- 7.1 Functions and Their Extrema -- 7.2...”