Dear all,

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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