Click on the blue math symbols to create an equation...

int amath int endamath int_{a}^{b} amath int_{a}^{b} endamath sum `sum` sum_{a}^{b} amath sum_{a}^{b} endamath prod amath prod endamath prod_{a}^{b} amath prod_{a}^{b} endamath

alpha amath alpha endamath beta amath beta endamath gamma amath gamma endamath delta amath delta endamath epsilon amath epsilon endamath zeta amath zeta endamath eta amath eta endamath theta amath theta endamath iota `iota`
kappa amath kappa endamath lambda amath lambda endamath mu amath mu endamath nu amath nu endamath xi amath xi endamath omega amath omega endamath pi amath pi endamath rho amath rho endamath sigma amath sigma endamath
tau amath tau endamath upsilon `upsilon` phi amath phi endamath chi amath chi endamath psi amath psi endamath

 

Note: sum, iota and upsilon don't appear to work in auto-recognize mode (use back-quotes instead)...