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.
Abdominal pain during your period could mean more than normal cramping -- it could be a sign of endometriosis. If pain during your period is consistently toward the higher numbers like 8, 9, or 10 on a pain intensity scale, you may be one of the 5 to 7 million women in America who suffer from this painful disorder.bdominal pain during your period could mean more than normal cramping -- it could be a sign of endometriosis. If pain during your period is consistently toward the higher numbers like 8, 9, or 10 on a pain intensity scale, you may be one of the 5 to 7 million women in America who suffer from this painful disorder.