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An example of two elements without a greatest common divisor

jul 12 10 at 16:41 Bill Dubuque 2,168●13●20

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On using field extensions to prove the impossiblity of a straightedge and compass construction

apr 25 at 20:38 ε-δ 1,028●5●16

 
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An example where GCD depends on the domain

mar 3 10 at 2:35 t3suji 2,717●1●8●13