The definition field of the function f (x) = Log &; (x + 1 / x-1) is

The definition field of the function f (x) = Log &; (x + 1 / x-1) is

(x+1)/(x-1)>0
The results are as follows
x+1>0
x-1>0
x>-1
x>1
The results show that: x > 1
or
x+1