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In history class in elementary school I remember learning that the Greeks would build their stone columns hollow because they thought this provided more support. Is it true that a hollow column is stronger? Thanks!

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It depends on whether you have a fixed volume of material or a fixed external dimension of the column. –  Ian Turner Apr 9 '13 at 8:02
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Hollow columns are stronger with respect to buckling (http://en.wikipedia.org/wiki/Buckling ).

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