eja: one more charpoly fix.

diff --git a/mjo/eja/eja_algebra.py b/mjo/eja/eja_algebra.py
index eca279f68156ef1cd8e407f2f8ad25661af1e517..3bc296446da3021ea8913996fa9932580e022934 100644 (file)
--- a/mjo/eja/eja_algebra.py
+++ b/mjo/eja/eja_algebra.py
@@ -1201,6 +1201,7 @@ class RationalBasisEJA(FiniteDimensionalEJA):
             if not all( all(b_i in QQ for b_i in b.list()) for b in basis ):
                 raise TypeError("basis not rational")
 
+        self._rational_algebra = None
         if field is not QQ:
             # There's no point in constructing the extra algebra if this
             # one is already rational.