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In quantum theory the state of a physical system is given by a vector in a complex vector space (usually a Hilbert space). This means that given any two states $\psi_1$ and $\psi_2$, also their sum as vectors $\psi_1 + \psi_2$ is represents a state. This is called the superposition of the two states.
Last revised on January 23, 2014 at 06:24:28. See the history of this page for a list of all contributions to it.