diff --git a/src/doc/en/constructions/calculus.rst b/src/doc/en/constructions/calculus.rst index 7be3c507d87..b9fe0ce4766 100644 --- a/src/doc/en/constructions/calculus.rst +++ b/src/doc/en/constructions/calculus.rst @@ -107,7 +107,7 @@ Formal power series expansions of functions can be had with the sage: (1/(2-cos(x))).series(x,7) 1 + (-1/2)*x^2 + 7/24*x^4 + (-121/720)*x^6 + Order(x^7) -Such series lack the ability to be fully manipulatable at the moment, +Certain manipulations on such series are hard to perform at the moment, however. There are two alternatives: either use the Maxima subsystem of Sage for full symbolic functionality:: @@ -117,7 +117,7 @@ Sage for full symbolic functionality:: sage: maxima(f).powerseries(x,0)._sage_() sum(2^(2*i4 - 1)*(-1)^i4*x^(2*i4)*bern(2*i4)/(i4*factorial(2*i4)), i4, 1, +Infinity) -Or you can use one the formal power series rings for fast computation. +Or you can use the formal power series rings for fast computation. These are missing symbolic functions, on the other hand:: sage: R. = QQ[[]]