Release Notes: This version fixes three bugs. The numerical sampling algorithm uses more samples, making it more robust. A bug has been fixed that made the program give incomplete output in cases where variables were defined, but not given a verbal description, in the XML file. Inverse trig functions are now rendered properly in mathml.
Release Notes: This release fixes a bug that caused an error when interpreting certain types of expressions involving units.
Release Notes: This release fixes a bug introduced in version 2.1.8, which caused incorrect evaluation of negative exponents when the base was a quantity with units.
Release Notes: A bug has been fixed that made the program unnecessarily slow when checking purely numerical answers.
Release Notes: This release improves the quality of the error messages in cases in which the input is a very complex expression containing undefined variables.
Release Notes: A few minor improvements have been made to the administration script. A potential security flaw has been fixed, and a bug has been fixed that made the script not default to the most recent semester.
Release Notes: A bug has been fixed in the handling of errors in which an exponent isn't unitless.
Release Notes: A bug has been fixed which sometimes caused crashes when the software was run under Perl 5.8.
Release Notes: Some bugs have been fixed in the mechanism to allow students to maintain text files online.