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A linear theory (quantum theory)?

  1. Mar 16, 2008 #1
    Some textbooks say that quantum mechanics is a linear theory. I don't know why?
    How can we decide a theory is a linear theory?
    Thank you!
  2. jcsd
  3. Mar 16, 2008 #2

    Doc Al

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    Staff: Mentor

    The governing equation (the Schrodinger Equation) is a linear differential equation. One consequence of linearity is that if [itex]\psi_1[/itex] and [itex]\psi_2[/itex] are both solutions, then so is [itex]\psi_1 + \psi_2[/itex].
  4. Mar 16, 2008 #3
    Thank you!
  5. Mar 16, 2008 #4
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