In this lecture, we shall look at some puzzles that you might have seen.
These puzzles have nothing to do with numbers but they are part of mathematics.
In fact, mathematics is not about numbers but about ideas.
We
say that a map is Eulerian if we can find
a circular walk that visits every street exactly
once.
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We
say that a map is edge-traceable from A to
B if we can find a walk that starts at A, finishes
at B and visits every street exactly once.
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