Sola ...

490 years ago, reformation 'officially' began.
Sola Fide
Sola Gratia
Sola Scriptura
Solo Christo
Soli Deo Gloria!

Depressed Equation

When I was in high school, I wanted to know whether there is a formula to find the roots of polynomial of degree more than 2 -- remember the ABC formula for quadratic polynomial. After several weeks (months?) my teacher came with a formula for cubic and quartic polynomial.

Today I search for those formulas. Reading it I came to a term 'depressed equation'. Hihi, equations can get depressed too. :-P

What's in a name?

Shakespeare may say so. But in fact, two names that differ in one letter can be totally different, e.g. van der Pol and van der Poel. While van der Pol equation is an ordinary differential equation, van der Poel is an ijssalon in Enschede. :D