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.
How long do you have cramps before your period - How long can you have cramps before a period? Variable! Cramps are usually uterine contractions but some feel intestinal cramps as cramps and so many different things can be interpretated as 'cramps'. How long do you have cramps before your period - How long can you have cramps before a period?