It means that adding any two numbers in the set will yield a number that is also a member of that set. For example, the set of rational numbers is closed under addition but the set {1,2,3,4} is not.
A set is closed under addition if the sum of any two members of the set is also in the set. For example, the set {0, 2, 4, 6, …} is closed under addition. The set {1, 3, 5, …} is not.
Closure under addition means that if you take any two elements from a set, their sum will also be an element of that same set. This property is crucial for determining whether a set is a subspace of a vector space, as it ensures that the addition of vectors within the set doesn't lead to an element outside of it.
Cancellation Law for Addition: If a+c = b+c, then a = b. This follows from the existence of an additive inverse (and the other laws), since Page 5 if a+c = b+c, then a+c+(−c) = b+c+(−c), so a +0= b + 0 and hence a = b. a = b.
Closure Property of Addition for Whole Numbers Addition of any two whole numbers results in a whole number only. We can represent it as a + b = W, where a and b are any two whole numbers, and W is the whole number set. For example, 0+21=21, here all numbers fall under the whole number set.
Closure property of addition states that in a defined set, for example, the set of all positive numbers is closed with respect to addition since the sum obtained adding any 2 positive numbers is also a positive number which is a part of the same set.
Being closed under addition means that if we took any vectors x1 and x2 and added them together, their sum would also be in that vector space. ex. Take  ï£ 1 2 3   and  ï£ 3 1 2  . Both vectors belong to R3. Their sum, which is  ï£ 4 3 5   is also a member of R3.
What is the meaning of closed under addition? For any two members of the set, the addition will return a value that is also a member of the set given that the set is closed. The addition of a set of positive integers is closed because the sum of two integers is an integer.
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