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A basic principle of solutions of *linear* differential (often wave) equations, ensuring that the sum ("superposition") of two solutions is automatically a solution as well. Conversely, solutions (amounting to quantum states in quantum mechanics, since the Schrödinger equation is linear) can be represented as a sum of two or more other distinct solutions, and so can be Fourier/eigenstate resolved to enhance mathematical tractability.

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Are there different types of superposition?

But while studying Waves, we use superposition in a different context. … I don't see how there is a connection between superposition in the two cases, if there is one. Does this mean that superposition is of different types? …
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Why some forces follow superposition principle?

When we say superposition applies to electrostatic force, we conclude that the interaction between a given source charge and the test charge is independent of interaction between other source charges and … Also why some forces follow superposition? …
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