Option variable
zeta%pi
Default value: true
When zeta%pi
is true
, zeta
returns an expression
proportional to %pi^n
for even integer n
.
Otherwise, zeta
returns a noun form zeta (n)
for even integer n
.
(%i1) zeta%pi: true$ (%i2) zeta (4); 4 %pi (%o2) ---- 90 (%i3) zeta%pi: false$ (%i4) zeta (4); (%o4) zeta(4)