I'm currently working on writing some python that can produce a quadratic
form from genus invariants. I've already implemented the rational
invariants case, and would be willing to put it into Sage at some point.
For the genus invariants I need to do variable substitutions on quadratic
forms. There does not appear to be a function to do this in the quadratic
forms class, so I've had to make my own representation. There is an
implementation for particularly simple substitutions, but not more complex
ones. Is this something that should also be fixed?
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