Terminal

$$ \hat{H} = \sum_{i=1}^{N} \hbar \omega_i \sigma_z^{(i)} + \sum_{\langle i,j \rangle} J_{ij} \sigma_x^{(i)} \sigma_x^{(j)} $$

$$ |\psi(t)\rangle = e^{-i\hat{H}t/\hbar} |\psi(0)\rangle $$

$$ C_{i_1 \dots i_m}^{j_1 \dots j_n} = \sum_{k} A_{i_1 \dots k} B^{k \dots j_n} $$