Exercise 2.44. Find the function (x1, x2, x3, x4) for the following definition ranges: 1 The function f(x1, x2, x3, x4) is defined only for

Exercise 2.44. Find the function ϕ(x1, x2, x3, x4) for the following definition ranges:

1 The function f(x1, x2, x3, x4) is defined only for vectors with one or three values 1.

2 The function f(x1, x2, x3, x4) is not defined for all vectors with two values 1.

3 The function f(x1, x2, x3, x4) is not defined for the vectors (1110) and

(1111).