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Linea 23:
:::<math>C_s = \lambda f = \frac {\omega}{k} </math>.
Pulsus, autem, generaliter constant in multis undis sinusoidalibus iunctim cui sunt distinctae frequentiae et distinctae <math>C_s</math>. In quadam substrato, igitur,
:<math>
f(x,t=0) = \int_{-\infty}^{+\infty} \frac {A(k)}{\sqrt{2\pi}}\, e^{ikx}\, dk, \,
</math>
tunc celeritas pulsus sua est
:<math>
C_p = \left \langle \frac{\partial \omega}{\partial k}\right \rangle = \int_{-\infty}^{+\infty} |{A(k)}|^2 \,\frac{\partial \omega}{\partial k}\, dk. \,
</math>
Etiam,
==Phaenomena quae undae ostendunt==
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