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s.t.

From Econterms, for About.com

Definition: s.t. is an abbreviation meaning "subject to" or "such that", where constraints follow.

In a common usage:

maxx f(x) s.t. g(x)=0

The above expression, in words, means: "The value of f(x) that is greatest among all those for which the argument x satisfies the constraint that g(x)=0." (Here f() and g() are fixed, possibly known, real-valued functions of x.) (Econterms)

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