3) Critically damped: [math]x(t) = (A + Bt)e^{- \gamma t}[/math] This is the optimally damped case, where the damping coefficient is just large enough to completely quell the oscillations, so the oscillator returns to zero in the least amount of time possible. 4) Overdamped: [math]x(t) = Ae^{- \gamma_{1}t} + Be^{- \gamma_{2}t}[/math]
DEAR READER: A woman is considered to be in menopause once it has been one year since her last period. Once menopause begins, vaginal bleeding is not normal. Post-menopausal bleeding (PMB) can happen for many reasons. It may result from infection or injury. Non-cancerous growths such as polyps and fibroids can cause PMB. So can bleeding disorders or use of blood thinners.
This phase presents similar symptoms to menopause that gradually increase, including fatigue, irritability, mood swings, and weight gain. The difference is that women in perimenopause continue to have periods, although they may be irregular. When you do not have a period for 12 months, you have entered menopause. Early menopause occurs in women between the ages of 40 and 45, and occurs naturally, in other words, is not medically or surgically initiated.