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Google have made numerous changes to the Math solvers documentation, including the addition of technical, content, and quality guidelines. The most significant change is the removal of the requirement for a solution page.
Updated the recommended properties for Math solvers to include the optional inLanguage property. Use this property to specify the language(s) that are supported by the maths problem solving website. See this table for a list of supported languages.
Google have updated the Math solvers documentation with the addition of six new problem type definitions:
Problem types are used for either the eduQuestionType for a MathSolver.potentialAction or for the assesses field of a MathSolver when the MathSolver is accompanying a HowTo that walks through a specific math problem.
This is a brand new rich result, designed for websites that provide solutions to mathematics problems. You can mark up your page with structured data to indicate the type of maths problems your solver can help with, and provide step-by-step walkthroughs for specific problems.