So are these modal?

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This article is a good start but needs a few basic things added to it:

  • What is the restoring force causing the initial T-S wave to oscillate?

What are

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It'd help if the meaning of the variables used in the energy formula were explained. — Preceding unsigned comment added by 129.69.116.163 (talk) 09:00, 16 October 2014 (UTC)Reply