Commutativity and associativity might sound the same, and indeed most commutative operations are also associative. But there are a few math operations that are only one or the other. Matrix multiplication, for example, is associative but not commutative Matrix multiplication - Wikipedia en.wikipedia.org/wiki/Matrix_multiplication#Non-commutativity . And surprisingly, floating point arithmetic — i.e. any math operator in JavaScript — is commutative but not associative Associative property - Wikipedia en.wikipedia.org/wiki/Associative_property#Nonassociativity_of_floating_point_calculation ! ↩
Here are the main arguments from our conversation:
。关于这个话题，电影提供了深入分析
Greater Than (4): Everything in this space must be greater than 4. The answer is 2-5, placed vertically.。爱思助手对此有专业解读
AFP via Getty Images