Question

is it 4-1=5? if yes give me proof

Answer 1

no, its 1.

Answer 2

err 4-1 = 3 no proof needed

Answer 3

4-1=3
lim x-1=3
x->4
let delta=epislon. Whenever 0<|x-4|<delta,
then
|f(x)-L|=|x-1-3|=|x-4|<delta=epilson.
By definition of a limit, lim x-1=3//
x->4

Answer 4

no, its true in roman numerals, IV-I=V