In the definition of categories, one of its condition :for any three objects A,B & C and its morphisms we have the composition of the two morphisms which takes from A to C Does that mean that we don't always have a composition between morphisms or it means that the composition must be in the set Mor(A,C) that is associated with the category.
Objects and its morphisms
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abstract-algebra
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3Please be aware there is a limit on the number of questions you can ask within a period of time. You should spend some time thinking about your own questions before asking them. – 2012-11-14