The general solutions for the harmonic oscillator differential equation fall into four general categories: 1) Undamped: [math]x(t) = Ae^{i\omega t}[/math] This is a free-running sinusoidal oscillation that doesn't change over time.
Key Facts. 1  Itâs normal to have mild cramps during your period. 2  Menstrual cramps often start 1-2 days after your period begins. 3  If your cramps donât get better with over-the-counter medicine, you should see your health care provider.
Uterine cramps after attaining menopause can be due to hormonal imbalance.Usually after menopause it takes few years until the hormonal levels are normalized and woman can have period like symptoms there after.If the pain is very severe it can be due to either cervicitis,dysplasia,pelvic infection etc.