S = 1 less than or equal to x less than 10

Question

S = 1 < x < 10

Answer 1

S is being described (with equal sign which is notation gray area for "described")

as an interval on the number line.

the number line goes from -infinity to +infinity

S is closed on the least side of the interval,

some number x (x≥1) and open on the greatest side (x<10)

most likely the interval is all real numbers with x in said boundaries

x element of real numbers

and x is in S where S is interval [1,10)

is more official way of describing S

using = sign normally means a left side equaling a right side.

then the equal sign is the "equal keeper"