Quotient of delta exponentials with fixed t and s

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Theorem: Let $\mathbb{T}$ be a time scale, $t,s \in \mathbb{T}$, and let $p,q \in \mathcal{R}(\mathbb{T},\mathbb{C})$. The following formula holds: $$\dfrac{e_p(t,s)}{e_q(t,s)} = e_{p \ominus q}(t,s),$$ where $e_p$ denotes the delta exponential and $\ominus$ denotes circle minus.

Proof: