isCartier D
A Weil divisor is $\QQ$-Cartier if some positive integer multiple is Cartier.
On a simplicial toric variety, every torus-invariant Weil divisor is $\QQ$-Cartier.
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In general, the $\QQ$-Cartier divisors form a proper subgroup of the Weil divisors.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/NormalToricVarieties/DivisorsDocumentation.m2:1692:0.