Latex Test
display inline \( \int_{a}^{b} x^2 dx \)
display block $$ \int_{a}^{b} x^2 dx $$
$$ ([r^{(1)}]_t,…,[r^{(t+1)}]_t)^T=M ([s^{(1)}]_t,…, [s^{(n)}]_t)^T $$
$$ ([r^{(1)}]_{2t}, …,[r^{(t+1)}]_{2t})^T=M([s^{(1)}]_{2t},…,[s^{(n)}]_{2t})^T $$
$$([r^{(1)}]_{2t},…,[r^{(t+1)}]_{2t})^T=M$$