A + B
A - B
-A
We can add or subtract two divisors:
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We can also add or subtract divisors with different coefficients.
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Finally, we can negate a divisor.
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The source of this document is in /build/reproducible-path/macaulay2-1.25.06+ds/M2/Macaulay2/packages/Divisor.m2:2791:0.