Delta wave equation

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Let $\mathbb{T}_1$ and $\mathbb{T}_2$ be time scales and $c \in \mathbb{R}$. Define the wave equation by $$u^{\Delta_1^2}=c^2 u^{\Delta_2^2},$$ where $\Delta_1$ and $\Delta_2$ denote partial $\Delta$-derivatives.

References

Partial dynamic equations on time scales