I am in Calculus 3, and I do not under stand what it means when they ask to find the relative extrema of f|S?(adsbygoogle = window.adsbygoogle || []).push({});

The problem is usually something like f:R^n=>R, (x,y,z) |=> (some function) , S= {(x,y) | x e R}

What does f|s mean? How does this relate to Lagrange multipliers? The book does not have an example of this notation and I can not seem to find any videos using this notation.

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# What does f|S mean?

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