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.
Menstrual cramps are pains in the abdomen and pelvic areas that can be experienced by a woman as a result of her menstrual period. Menstrual cramps are not the same as the discomfort felt duringpremenstrual syndrome (PMS), although the symptoms of both disorders can sometimes be experienced as a continuous process.