User:The Scarlet Letter/Formulae

$$\Delta=d(S^1)\frac{\sum_{i=0}^{\infty}b(i)}{\sum_{i=0}^{\infty}d(i)b(i)}+d(S^1)\frac{z(n)}{y(n)}\frac{\sum_{i=S^1}^{\infty}b(i)}{\sum_{i=0}^{\infty}b(i)d(i)}-\theta(n)=0$$

$$W=\int_0^{n(S)}\int_0^\infty y(j)b(i)di\,dj+\int_0^{n(S)}\sum_{i=S}^\infty z(j)b(i) dj$$