quasiconcave, and the minimum of strictly-quasiconcave functions is strictly-quasiconcave.
* composition with a non-decreasing function : quasiconvex, non-decreasing, then is quasiconvex. Similarly, if quasiconcave, non-decreasing, then is quasiconcave.
* minimization (i.e. quasiconvex, convex set, then is quasiconvex)

Operations not preserving quasiconvexity

* The sum of quasiconvex functions defined on the same domain need not be quasiconvex: In other words, if are quasiconvex, then need not be quasiconvex.

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