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.
PMS affects girls a little bit before their period starts and gets better when they actually have their period, while period cramps usually start as soon as girls get their period. Period cramps normally start right before you get your period and are at their worst about a day after you first start feeling sore.You might get cramps more than your mum or older sister as they tend to affect younger women and girls more and get less painful with age.MS affects girls a little bit before their period starts and gets better when they actually have their period, while period cramps usually start as soon as girls get their period. Period cramps normally start right before you get your period and are at their worst about a day after you first start feeling sore.