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Results tagged with calculus-of-variations 
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                                 user 84759
    Questions on the calculus of variations, which deals with the optimization of functionals mostly defined on infinite dimensional spaces.
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    How can you compute the maximum volume of an envelope(used to enclose a letter)?
                It's obvious that the volume of a envelope is 0 when flat and non-0 when you open it up. However, if you were to fill it with liquid, there must be some shape where it has a maximum volume. Is there a …