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Group-stack
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<p>In algebraic geometry, a group-stack is an <a href="/facts/Algebraic_stack/flrtwvwU">algebraic stack</a> whose categories of points have group structures or even <a href="/facts/Groupoid/hvj8wvWe">groupoid</a> structures in a compatible way. It generalizes a <a href="/facts/Group_scheme/bJW14FE2">group scheme</a>, which is a scheme whose sets of points have group structures in a compatible way. </p>