Talk:Piecewise linear function

Definition of a linear function

Latest comment: 15 years ago3 comments3 people in discussion

A linear function f(x) is said to be linear if and only if f(αx₁+βx₂) = αf(x₁) + βf(x₂)

According to this definition, the function f(x) = a_Ix + b_I in the article is not linear. Joao 16:51, 1 March 2007 (UTC)Reply

True, but nonetheless the nomenclature here is standard when used in this context. Michael Hardy 23:04, 1 March 2007 (UTC)Reply

To be precise about "in this context": It is very common to use "linear" and "affine linear" interchangeably. It is really only in the context of linear algebra (and more generally, module theory) that these terms are strictly distinguished, and in this special case, affine linear is of no interest. In the context where the ___domain is not an algebraic structure, nominally a group, no one cares. 129.107.225.4 (talk) 05:39, 19 March 2010 (UTC)Reply