fundamental group
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enMaths in a minute: The fundamental group
http://plus.maths.org/content/maths-minute-fundamental-group
<p>Topologists famously think that a doughnut is the same as a coffee cup because one can be deformed into the other without tearing or cutting. In other words, topology doesn't care about exact measurements of quantities like lengths, angles and areas. Instead, it looks only at the overall shape of an object, considering two objects to be the same as long as you can morph one into the other without breaking it. But how do you work with such a slippery concept?</p><p><a href="http://plus.maths.org/content/maths-minute-fundamental-group" target="_blank">read more</a></p>http://plus.maths.org/content/maths-minute-fundamental-group#commentsfundamental groupgroup theorytopologyMon, 11 Apr 2011 09:18:34 +0000mf3445465 at http://plus.maths.org/content