Can it be expressed in a formula?

Question

Mathematics

I accidentally stumbled upon the schedule and conditions, I became interested in whether these conditions can be expressed in one formula.
Y = 0 for X < 3
Y = 2 for X >= 3 and X < 6
Y = 4 for X > 6

Answer 1

What type of record do you need.
In mathematics, like this:
In JS, you can write like this:
y = 4*(x>6) || 2*(x>=3) || 0
options mass

Answer 2

Yes, in mathematical notation, a curly bracket with 3 conditions is used for this.

Answer 3

Can be expressed in several ways:
1) piecewise function
2) rect function
3) fourier
4) simple product of functions
5) any other approximation