Abel's theorem

From timescalewiki
Revision as of 16:53, 2 October 2014 by Tom (talk | contribs) (Created page with "Let $\mathbb{T}$ be a time scale and consider the dynamic equation defined by the linear operator $$L_2 y(t) = y^{\Delta \Delta}(t) + p(t) y^{\Delta}(t) + q(t)y(t),$$ wher...")
(diff) ← Older revision | Latest revision (diff) | Newer revision → (diff)
Jump to: navigation, search

Let $\mathbb{T}$ be a time scale and consider the dynamic equation defined by the linear operator $$L_2 y(t) = y^{\Delta \Delta}(t) + p(t) y^{\Delta}(t) + q(t)y(t),$$ where $p,q$ are rd-continuous.

Theorem: Let $t_0 \in \mathbb{T}^{\kappa}$ and assume $L_2 y = 0$ is regressive. Suppose that $y_1$ and $y_2$ are two solutions of $L_2 y=0$. Then their wronskian satisfies $$W(t) = e_{-p+\mu q}(t,t_0)W(t_0)$$ for $t \in \mathbb{T}^{\kappa}$.

Proof: