$p(x) = p = \overset{n}{\underset{i=1}{\prod}} p(s_n | s_1, ... , s_{n-1})$
p(x)=p=∏i=1np(sn∣s1,...,sn−1)p(x) = p = \overset{n}{\underset{i=1}{\prod}} p(s_n | s_1, ... , s_{n-1})p(x)=p=i=1∏np(sn∣s1,...,sn−1)
\mathcal{M(y)}
M(y)\mathcal{M(y)}M(y)
