Comic #2151: 2011-04-04

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Description

The comic features a graph with the following elements:

• The vertical axis is labeled "DIFFICULTY OF PROVING A MATHEMATICAL FACT."
• The horizontal axis is labeled "OBVIOUSNESS OF THAT FACT."

A red curve rises sharply from the lower left to the upper right, illustrating an increase in difficulty as the obviousness of a mathematical fact increases.

At the end of the curve, there is a note that reads: "Prove that a set of elements contains the elements it contains."