To display the intersection of regions,
Put each inequality in a parenthesis and then "and" the parentheses as necessary.
The expression like f (x) < y < g (x) is also available.
Example 1: the intersection region of x + y > 1 and x2 + y2 < 4,
write
(x + y > 1) and (x2 + y2 < 4)
Example 1: the intersection region of x < y and y < x2 + 1, write
(x < y) and (y < x2 + 1)
or
x < y < x2 + 1
Attention: "or" is not available, neither the nesting of parentheses (parentheses in parentheses).