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# Article

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Keywords:
nonlinear parabolic system; fractional differentiability; spatial derivative; weak solution
Summary:
We are concerned with the problem of differentiability of the derivatives of order $m+1$ of solutions to the “nonlinear basic systems” of the type $$(-1)^m \sum _{|\alpha | = m}D^{\alpha } A^{\alpha }\big (D^{(m)}u\big )+ \frac {\partial u}{\partial t} = 0 \quad \text {in} \ Q.$$ We are able to show that $$D^{\alpha }u \in L^2\bigl (-a, 0, H^{\vartheta }\big (B(\sigma ),\mathbb {R}^N\big )\big ), \quad |\alpha |=m+1,$$ for $\vartheta \in (0, {1}/{2})$ and this result suggests that more regularity is not expectable.
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