I am trying to move a matrix into an iterator over its rows or columns. row_iter() borrows the matrix, which breaks my usecase:

fn large_f<N, It: Iterator<Item=N>>(matrix_map: impl Fn(Matrix) -> It, mat: Matrix) { ... }

I need a a function that can map a matrix to an iterator for the same operations either on the matrix' rows or columns.

let mat = ...;
large_f(
    |mat

In PR #3901 support was added to apply a homomorphism f to an element x by writing f(x) instead of Image(f, x).

We could do something similar for univariate polynomials. (For multivariate ones, the issue is that it is not clear how the order of arguments should be mapped to the various variables; I'd rather avoid that can of worms).

Make docker image available with JIB:

• https://github.com/GoogleContainerTools/jib
• https://github.com/GoogleContainerTools/jib/tree/master/jib-maven-plugin

The docker image should be updated automatically on each master commit. Therefore we need a GitHub Action "Java with Maven".
These 3 applications should be available:

• [MMA-browser-usage](https://github.com/axkr/symja_android_libr