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A binary relationship is a type of relationship between the entities, which links to types of entities in it.
Subtraction is nothing like addition. If you are talking about addition, it means that 1+1=2 - one entity + one entity = two entities. Entities=numbers. However, for subtraction it is the opposite. 1-1 = 0 - one entity eats/- one entity = zero entities. There are no other entities to eat except for itself. Thus when it eats itself, there are no more entities left.
lrespect of mathematical entities
It says that you should not postulate unnecessary entities.
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