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times the curvature of φ over φ.
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So it has to do with the shape of φ.
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And remember, if you multiply Ψ by
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a constant, you multiply the curvature by the same constant,
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so the kinetic energy stays the same.
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So it's only what we say, the shape, not really the amplitude,
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because that scales with the curvature.
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Okay, but now we can rearrange this, this way.
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So we have a formula here for the curvature of Ψ.
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Now if you have a formula for the curvature,
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if you know how a curve is going to change,
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how a line is going to change its curvature,