New theorem about funcoids and reloids

I’ve added to the preprint of my book a new theorem (currently numbered theorem 8.30).

The theorem states:

Theorem g \circ ( \mathcal{A} \times^{\mathsf{RLD}} \mathcal{B}) \circ f = \langle ( \mathsf{FCD}) f^{- 1} \rangle \mathcal{A} \times^{\mathsf{RLD}} \langle ( \mathsf{FCD}) g \rangle \mathcal{B} for every reloids f, g and filters \mathcal{A} \in \mathfrak{F}^{\mathrm{Dst}\, f}, \mathcal{B} \in \mathfrak{F}^{\mathrm{Src}\, g}.

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