Newton Polygons [HB 58]

Removals and Changes:

• The interpretation of a precision with respect to some exponent denominator has been clarified. The exponent denominator it is with respect to is the lowest common multiple of the exponent denominator of the root or expansion and the exponent denominators of the coefficients of the polynomial. Since denominators have if anything increased, the precision of answers has decreased.

• The curve taken as an argument to NewtonPolygon must now be of the type Crv--one of the new scheme types.

Bug Fixes:

• Some expansions giving more precision than was asked for have been amended, reducing the precision to the required amount. (This excess was above that due to the reinterpretation of precision with respect to exponent denominators).