NEWS.md

3.3.0

• adds simplify_fractions which turns an expression into a single fraction and simplifies by dividing the numerator and denominator factors by appropriate GCDs
• Use new fraction_iszero and fraction_isone functions from SymbolicUtils to implement iszero and isone respectively.
• x / x etc. are no more simplified on construction, call simplify_fractions to simplify them.