Solving A*x=b in Nemo

General Usage
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Yes. By the way, if you want to convert to Matrix{Int}, the correct way would be

julia> A = QQFieldElem[1 0 0; 0 1 1; 0 3 0; 0 0 1]
4×3 Matrix{QQFieldElem}:
 1  0  0
 0  1  1
 0  3  0
 0  0  1

julia> map(x -> Int(ZZ(x)), A)
4×3 Matrix{Int64}:
 1  0  0
 0  1  1
 0  3  0
 0  0  1

The version with x.num will give (silently) wrong results:

julia> A = QQFieldElem[1 0 0; 0 1 1; 0 3 0; 0 0 18446744073709551615]
4×3 Matrix{QQFieldElem}:
 1  0  0
 0  1  1
 0  3  0
 0  0  18446744073709551615

julia> Aint = conv2int(A)
4×3 Matrix{Int64}:
 1  0                    0
 0  1                    1
 0  3                    0
 0  0  4611686018537972628
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