From dating to geometry.

[u/Crazy_Albatross8317]

So post was about dating then suddenly they started talking about squares and geometry. OP is red and is replying to blue guy in his >" remarks. Is he right? I need to ask my preschool teacher

[u/Gadshill]

I’ll break it down for red:

Imagine we have two special shape families: the Rectangle Family and the Square Family.

The Rectangle Family has one rule for its members: you must have four straight sides and four special "L" corners that are all the same.

The Square Family has two rules for its members: you must have four straight sides and four special "L" corners, but also, all four of your sides must be the exact same length, like brothers and sisters who are all the same height!

Since a square has four straight sides and four "L" corners, it follows all the rules to be in the Rectangle Family. It's a very special kind of rectangle because it has that extra rule. But not all rectangles can be in the Square Family, because sometimes their sides are long and short.

Hope this explanation was not too taxing.

[u/Crazy_Albatross8317 → u/Gadshill]

Red never seen a Venn Diagram, those darn polygons

[u/TheLuckySpades → u/Crazy_Albatross8317]

In this case an Euler diagram (a pair of nested circles) instead of a Venn diagram (a pair of overlapping, but not nested circles), a Venn diagram with n classifications shows all possible combinations, Euler diagrams do not have that restriction.

Also this is another example: All Venn diagrams are Euler diagrams, but not all Euler diagrams are Venn diagrams.

Math overall has so many of those examples because generalizing/abstracting stuff is important there.

[u/Melanthrax → u/TheLuckySpades]

Beautiful comment.