>
> Such errors are either obvious or invisible. A remedy is often to figure the
> problem on paper (or in your head if you're good at thinking visually).
> Here, just draw a line segment with secret in the middle and the interval
> borders around. Then, write there on the drawing the _values_ of the
> borders, as arithmetic expressions.
Very much so. Diagrams are important. Not everything is textual.
(Which you might consider with some irony based on some of the
meta-discussion on this thread.)
See some of the problem-solving heuristics described in:
http://en.wikipedia.org/wiki/How_to_Solve_It
"Can you think of a picture or a diagram that might help you
understand the problem?"
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