| (1) | p(t) = p_i + \int_{-\infty}^t \, p_u(t-\tau) \, \delta q(\tau) \, d \tau |
Discrete form:
| (2) | p(t) = p_i + \sum_k \, p_u(t-\tau_k) \, q(\tau_k) |
| (1) | p(t) = p_i + \int_{-\infty}^t \, p_u(t-\tau) \, \delta q(\tau) \, d \tau |
Discrete form:
| (2) | p(t) = p_i + \sum_k \, p_u(t-\tau_k) \, q(\tau_k) |