Top network posts

• 33 How can 4 resistors of 30ohms each be connected so you end up with a resistance of 18ohms?
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• 19 Is there a geometric interpretation for Reidemeister torsion?
• 16 Why can you find the roots a of polynomial by factoring it?
• 16 What does it mean for something to hold "up to isomorphism"?
• 14 Is every loop in a 3-manifold homotopic to some loop on its boundary?
• 13 A normal subgroup that is not a characteristic
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