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Results tagged with examples
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user 14905
For questions requesting examples of a certain structure or phenomenon
151
votes
Awfully sophisticated proof for simple facts
Here's a topological proof that $\mathbb{Z}$ is a PID.
Let $p,q$ be relatively prime. Then the line from the origin to the point $(p,q)\in\mathbb{R}^2$ does not pass through any lattice point, and th …