Math Memes

4! Is meant to be 4 factorial. 4! = 4 x 3 x 2 x 1 = 24

4! Is a factorial which means it's 4 x 3 x 2 x 1 = 24

4 factorial

The exclamation point denotes the factorial function. 4! = 4 ⋅ 3 ⋅ 2 ⋅ 1

I see no one has explained yet, so I'll give it a shot. He is excited about math, and that needs to be encouraged.

The exclamation point makes it right. The formula, when worked with proper order of operations, equals 24, which is equal to 4 factorial (4!) 1 * 2 * 3 * 4=24

Unexpected expected factorial

You might find Lojban interesting if you are not already aware. (I haven't tried to learn it myself, I just know it exists)

I believe you mean, "nice pun!"

I've never seen ! used for boolean NOT in maths, just ¬. I think ! is something programming languages went for because it's easier to type. That said, screw (a, b). Is that a (coordinate) pair, an interval, an inner product, some secret fourth thing? Who knows!

No it isn't

for those that didn't get it: clever factorial = brilliant