--- a/src/LazyTensors/lazy_tensor_operations.jl	Fri Mar 18 21:17:01 2022 +0100
+++ b/src/LazyTensors/lazy_tensor_operations.jl	Fri Mar 18 21:26:02 2022 +0100
@@ -303,83 +303,6 @@
 end
 
 
-"""
-    split_index(::Val{dim_before}, ::Val{dim_view}, ::Val{dim_index}, ::Val{dim_after}, I...)
-
-Splits the multi-index `I` into two parts. One part which is expected to be
-used as a view, and one which is expected to be used as an index.
-Eg.
-```
-split_index(Val(1),Val(3),Val(2),Val(1),(1,2,3,4)) -> (1,:,:,:,4), (2,3)
-```
-
-`dim_view` controls how many colons are in the view, and `dim_index` controls
-how many elements are extracted from the middle.
-`dim_before` and `dim_after` decides the length of the index parts before and after the colons in the view index.
-
-Arguments should satisfy `length(I) == dim_before+B_domain+dim_after`.
-
-The returned values satisfy
- * `length(view_index) == dim_before + dim_view + dim_after`
- * `length(I_middle) == dim_index`
-"""
-function split_index(::Val{dim_before}, ::Val{dim_view}, ::Val{dim_index}, ::Val{dim_after}, I...) where {dim_before,dim_view, dim_index,dim_after}
-    I_before, I_middle, I_after = split_tuple(I, Val(dim_before), Val(dim_index))
-
-    view_index = (I_before..., ntuple((i)->:, dim_view)..., I_after...)
-
-    return view_index, I_middle
-end
-
-# TODO: Can this be replaced by something more elegant while still being type stable? 2020-10-21
-# See:
-# https://github.com/JuliaLang/julia/issues/34884
-# https://github.com/JuliaLang/julia/issues/30386
-"""
-    slice_tuple(t, Val(l), Val(u))
-
-Get a slice of a tuple in a type stable way.
-Equivalent to `t[l:u]` but type stable.
-"""
-function slice_tuple(t,::Val{L},::Val{U}) where {L,U}
-    return ntuple(i->t[i+L-1], U-L+1)
-end
-
-"""
-    split_tuple(t::Tuple{...}, ::Val{M}) where {N,M}
-
-Split the tuple `t` into two parts. the first part is `M` long.
-E.g
-```julia
-split_tuple((1,2,3,4),Val(3)) -> (1,2,3), (4,)
-```
-"""
-function split_tuple(t::NTuple{N,Any},::Val{M}) where {N,M}
-    return slice_tuple(t,Val(1), Val(M)), slice_tuple(t,Val(M+1), Val(N))
-end
-
-"""
-    split_tuple(t::Tuple{...},::Val{M},::Val{K}) where {N,M,K}
-
-Same as `split_tuple(t::NTuple{N},::Val{M})` but splits the tuple in three parts. With the first
-two parts having lenght `M` and `K`.
-"""
-function split_tuple(t::NTuple{N,Any},::Val{M},::Val{K}) where {N,M,K}
-    p1, tail = split_tuple(t, Val(M))
-    p2, p3 = split_tuple(tail, Val(K))
-    return p1,p2,p3
-end
-
-
-"""
-    flatten_tuple(t)
-
-Takes a nested tuple and flattens the whole structure
-"""
-flatten_tuple(t::NTuple{N, Number} where N) = t
-flatten_tuple(t::Tuple) = ((flatten_tuple.(t)...)...,) # simplify?
-flatten_tuple(ts::Vararg) = flatten_tuple(ts)
-
 @doc raw"""
     LazyOuterProduct(tms...)