- zero() (sage.categories.commutative_additive_monoids.CommutativeAdditiveMonoids.ParentMethods method)
- (sage.categories.examples.commutative_additive_monoids.FreeCommutativeAdditiveMonoid method)
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- zero_element() (sage.categories.commutative_additive_monoids.CommutativeAdditiveMonoids.ParentMethods method)
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