(({{0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}, {0, 0, 0, 0, 0, 0, 0, 0, 0, 0}}))

({{\[Placeholder], \[Placeholder]}, {\[Placeholder], \[Placeholder]}, {\[Placeholder], \[Placeholder]}, {\[Placeholder], \[Placeholder]}, {\[Placeholder], \[Placeholder]}, {\[Placeholder], \[Placeholder]}})

σx = (({{0, 1}, {1, 0}}));
σ0 = (({{1, 0}, {0, 1}}));

KroneckerProduct[σx,σ0]//mf;

KroneckerProduct[σ0,σx]//mf;

LoadSpinChainMatrices[2,"a"]

sx[1]//mf;

sx[2]//mf;

sz[1]//mf;

LoadSpinChainMatrices[5,"a"]

sx[1]//mf;

LoadSpinChainMatrices[2,"a"]

sx[1].sx[2]//mf;

LoadSpinChainMatrices[2(*,"a"*)]
sx[1].sx[2]//mf;

LoadSpinChainMatrices[2,"a"]
LoadedMatrices

sx[1]//mf;

kron[σx,σ0]//mf;

A = sx[1]+sx[2]//mf;

exp1=MatrixExp[A]//mf;

MatrixExp[σx]//mf;

exp2=kron[MatrixExp[σx],MatrixExp[σx]]//Simplify//mf;

exp1-exp2//Simplify//mf;

LoadBosonicOperators[nmax = 20,"a"];

LoadedMatrices

a//mf;

a\[ConjugateTranspose].a//mf;

kron[a,σx]//Dimensions

LoadArbitrarySpinMatrices[S=10]

LoadedMatrices

Sx//mf;