It seems a bug:

sage: bool(AA(sqrt(2))/pi == sqrt(2)/pi)
TypeError: ECL says: THROW: The catch MACSYMA-QUIT is undefined.

The following comparison is fine, though.

sage: bool(AA(sqrt(2)) == sqrt(2))
True

To fix this, we provide elements of AA and QQbar with a _maxima_init_ method that

• handles the case of elements for which Sage can find a radical expression and
• raises an error in all other cases.
  This is better than sending the unusable print representation of algebraic numbers (including ?) to Maxima.

CC: @mkoeppe @DaveWitteMorris @videlec @tscrim

Component: symbolics

Author: Matthias Koeppe

Branch/Commit: 58f4cd1

Reviewer: Travis Scrimshaw

Issue created by migration from https://trac.sagemath.org/ticket/34235