PowerSymmetricPolynomial[r] represents a formal power symmetric polynomial with exponent r.PowerSymmetricPolynomial[{r_1, r_2, ...}] represents a multivariate formal power ...
PrecedenceForm[expr, prec] prints with expr parenthesized as it would be if it contained an operator with precedence prec.
PrecedesEqual[x, y, ...] displays as x \[PrecedesEqual] y \[PrecedesEqual] ....
Precedes[x, y, ...] displays as x \[Precedes] y \[Precedes] ....
PrecedesSlantEqual[x, y, ...] displays as x \[PrecedesSlantEqual] y \[PrecedesSlantEqual] ....
PrecedesTilde[x, y, ...] displays as x \[PrecedesTilde] y \[PrecedesTilde] ....
PrecisionGoal is an option for various numerical operations which specifies how many effective digits of precision should be sought in the final result.
Precision[x] gives the effective number of digits of precision in the number x.
--x decreases the value of x by 1, returning the new value of x.
PreemptProtect[expr] evaluates expr, without any interruption from preemptive evaluations.