indeed they do.
It's a mistake in the doc.

On Fri, Jul 27, 2018 at 1:54 AM, Cem Bassoy via ublas <ublas@lists.boost.org> wrote:
I was investigating the documentation and implementation of the matrix and vector expression template. The current documentation (v. 1.67) says that Matrix Expression, Vector Expression and Scalar Expression do not have public base classes. But I think they do inherit from ublas_expression, see e.g. Scalar Expression.

Cem

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