Multiplication Sign

The symbol × used to denote multiplication, i.e., a×b denotes a times b.

The symbol × is also used to denote a group direct product, a Cartesian product, or a direct product in the appropriate category (such as a Cartesian product of manifolds when it is implied that the smooth structure is the natural product structure.) The similar symbol  tensor is reserved for a tensor product, which may rear its head in several guises, representations, bundles, modules.

Portions of this entry contributed by Todd Rowland

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Cite this as:

Rowland, Todd and Weisstein, Eric W. "Multiplication Sign." From MathWorld--A Wolfram Web Resource.

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