`basis`#

Inverted solution basis \(\tilde{\mathbf{V}}\).

The inverted solution basis is a matrix containing column vectors like \(\tilde{\mathbf{V}}=\begin{bmatrix}\tilde{\mathbf{v}}_1&\cdots\tilde{\mathbf{v}}_r\end{bmatrix}\in\mathbb{R}^{N\times r}\).