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.
Gas pains are usually higher on the pain scale than menstrual cramps, although the amount of time that the pain level is high is short. The best way to know if you have gas pain or menstrual cramps is to eliminate any cause of gas pain before your period starts.