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GAP 4.8.9 installation with standard packages -- copy to your CoCalc project to get it

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\begin{sequent}
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\begin{align*}
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a: \Obj ~|~ \IsZero \big( a \big) \vdash \IsZero \big( \IdentityMorphism( a ) \big)
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\end{align*}
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\end{sequent}
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\begin{sequent}
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\begin{align*}
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a: \Obj, b: \Obj ~|~ \IsZero \big( a \big), \IsZero \big( b \big) \\
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\vdash & \IsZero \big( \DirectSum( [ a, b ] ) \big)
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\end{align*}
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\end{sequent}
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