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.
Possible Causes of Cramps but No Period. Your Period is late â There are times when a womanâs menstruation becomes delayed this is because ovulation is still taking place. Usually, a woman gets her period about a couple of weeks after the ovulation period. Aside from the menstruation, people also experience some bowel problems at times.