Michael Kraus

In Julia v1.7 this has a nasty side effect: ``` julia> inv(A) ERROR: MethodError: no method matching checknonsingular(::Int64, ::Val{true}) Closest candidates are: checknonsingular(::Any) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.7/LinearAlgebra/src/factorization.jl:21 checknonsingular(::Any, ::LinearAlgebra.RowMaximum) at /Users/julia/buildbot/worker/package_macos64/build/usr/share/julia/stdlib/v1.7/LinearAlgebra/src/factorization.jl:19 checknonsingular(::Any,...

Is it not? As far as I can see, the problem comes from `checknonsingular` being called on the `true` that appears in the expression of the inverse, which maybe shouldn't...

Ok, then I'll open another issue (#357).

I forgot to update the docs when extracting the example code into [GeometricProblems.jl](https://github.com/JuliaGNI/GeometricProblems.jl) All examples should work now, cf. https://juliagni.github.io/GeometricIntegrators.jl/latest/integrators/