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C_p = \left \langle \frac{\partial \omega}{\partial k}\right \rangle = \int_{-\infty}^{+\infty} |{A(k)}|^2 \,\frac{\partial \omega}{\partial k}\, dk. \,
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Etiam, si ω = constans × k vel constans × k<sup>2</sup>, tum celeritas pulsus celeritas simpliciter aequat <math>\frac{\partial \omega}{\partial k}</math> quam evaluamus valore ''k'' promedio utendo. Exemplum speciale est unda stataria, in imaginem adhinc monstrata, cui adamussim est valore zero et ''k'' promedius et pulsus celeritas ''C<sub>p</sub>''.
 
==Phaenomena quae undae ostendunt==