# Delta derivative of sum

From timescalewiki

## Theorem

Let $\mathbb{T}$ be a time scale and let $f,g \colon \mathbb{T} \rightarrow \mathbb{R}$ be delta differentiable at $t$. Then the function $f+g \colon \mathbb{T} \rightarrow \mathbb{R}$ is delta differentiable with $$(f+g)^{\Delta}(t)=f^{\Delta}(t)+g^{\Delta}(t).$$

## Proof

## References

- Martin Bohner and Allan Peterson:
*Dynamic Equations on Time Scales*(2001)... (previous)... (next): Theorem 1.20 (ii)