It's an idiom in math meaning "a problem, together with its solution, that illustrates a general principle or technique". A worked example of the quadratic for

It's an idiom in math meaning "a problem, together with its solution, that illustrates a general principle or technique". A worked example of the quadratic formula would be solving a particular equation by plugging in values of a, b, c into the formula. A worked example of analytic combinatorics is solving a combinatorics problem with techniques from real/complex analysis.