# Non-Linear Transformation

Can a person clarify to me in straightforward terms what a non-linear transformation remains in mathematics?

I recognize some single-variable calculus, yet I read it concerns multi-variable calculus, which I'm not accustomed to.

If a person can clarify it in straightforward words, that would certainly be handy.

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2019-05-07 00:23:29
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In enhancement to the definition of straight map that Tomer advise you, below are 2 instances.

As an example, $f(x,y) = x^2y$ is not a straight map $f: \mathbb{R}^2 \longrightarrow \mathbb{R}$ due to the fact that

$$f(2x,2y) = 4x^22y \neq 2x^2y = 2f(x,y) \ .$$

More usually, the straight maps $f: \mathbb{R}^m \longrightarrow \mathbb{R}^n$ are always of the kind

$$f(x_1, \dots , x_m) = (a_1^1 x_1 + \dots + a_1^m x_m , \dots , a_n^1 x_1 + \dots + a_n^m x_m)$$

with $a^i_j$ constant coefficients.

So, 2 even more instances:

1. $f(x,y) = x + 2y$ is a straight map.
2. $f(x,y,z) = 3x + 1$ is a non - straight map
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2019-05-09 03:45:59
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Let $V_1, V_2$ be 2 vector spaces over the field $F$. A transformation $T: V_1 \to V_2$ is straight if for every single $x, y \in V_1$ and also every $\alpha \in F$ it holds true that

(*) $T(x + \alpha y) = T(x) + \alpha T(y)$

T is not a straight transformation if there are some $x, y, \alpha$ such that (*) is not real.

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2019-05-08 20:56:37
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