Cartesian Product

An ordered pair $(x,y)$ is a collection of two elements, $x$ and $y$, that are assigned a particular order. Here, it’s important to note that in the pair $(x,y)$, $x$ is the first element and $y$ is the second element. So, if $x\ne y$, then we can conclude that $(x, y)\ne (y, x)$. Moreover, given that $(x, y) = (j, k)$, we can deduce that it means $x = j$ ...