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{title2=$\theta$}

The null expansion is $\theta=P^{ab}\widehat B_{ab}$. It is the logarithmic derivative of an infinitesimal transverse area: $\theta=A^{-1}dA/d\lambda$.


Null expansion

Past exam of the mathematics course of the University of Cambridge / 2026 / iii / Paper 311 / 1 / a / iii / Solution

Null expansion ( $θ$ )

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Null expansion (θ)

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