!!! Overview
[{$pagename}] the net response caused by two or more stimuli is the sum of the responses that would have been caused by each stimulus individually. 
Which implies that if input A produces response X and input B produces response Y then input (A + B) produces response (X + Y).

A [function] F(x) that satisfies the superposition principle is called a [linear] function. [{$pagename}] can be defined by two simpler [function]; 
* additivity - F(x%%sub 1 %%+ x%%sub 2 %%) = F(x%%sub 1 %%) + F(x%%sub 2%% ) 
* homogeneity - F(ax) = aF(x)

[{$pagename}] is the [states] of quantum systems that are added together and subtracted from each other. Mathematically, the rules for combining [quantum] [states] can be described in the same way as the rules for adding and subtracting within a [Vector Space]. 

This what is behind strange [quantum] effects that you may have heard about, such as the double-slit experiment, or particle-wave duality.

!! More Information
There might be more information for this subject on one of the following:
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* [#1] - [Superposition_principle|Wikipedia:Superposition_principle|target='_blank'] - based on information obtained 2019-05-24 
* [#2] - [Puzzled by Quantum Entanglement? Here's How It Works|https://curiosity.com/topics/puzzled-by-quantum-entanglement-heres-how-it-works-curiosity/|target='_blank'] - based on information obtained 2019-05-24