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First principle: superposition
- with each physical system there is an associated Hilbert space Failed to parse (Cannot write to or create math temp directory): \cal{E}_ {\rm H}

- at each time t, the state of the system is completely determined by a normalized vector $|\psi(t) \rangle$

Second principle: measurement
- with each physical quantity $A \$ one can associate a linear hermitian operator $\hat{A} \$

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 === major concepts ===
-* the three principles of quantum mechanics.  page 101.
+== the three principles of quantum mechanics.  page 101.==
-** with each physical system there is an associated Hilbert space.
-** at each time t, the state of the system is completely determined by a normalized vector <math>|\psi(t) \rangle</math>
+* First principle:  superposition
+** with each physical system there is an associated Hilbert space <math>\cal{E}_ {\rm H}</math>
+** at each time t, the state of the system is completely determined by a normalized vector <math>|\psi(t) \rangle</math>
+* Second principle: measurement
+** with each physical quantity <math>A \ </math> one can associate a linear hermitian operator <math>\hat{A} \ </math>