User Mark Opitz - MathOverflow

Mark Opitz

Member for 12 years, 3 months
Last seen more than 11 years ago

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Good Question

Aug 29, 2012
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Mar 31, 2022

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Aug 24, 2012
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Aug 22, 2012
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Nov 8, 2016

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homological-algebra

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gr.group-theory

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Top posts

34

Non-split extension of the rationals by the integers

Aug 22, 2012

8

Can Ext over a group ring always be expressed as group cohomology ?

Dec 20, 2012