diff --git a/linalg-practice.py b/linalg-practice.py
index c4f2e0d..654e0c7 100644
--- a/linalg-practice.py
+++ b/linalg-practice.py
@@ -139,7 +139,7 @@ def practice(t) :
                 c = a.LUdecompositionFF()[3]
                 croots = {k: k for k in sp.roots(c.charpoly()) if k not in sp.roots(c.charpoly(), filter='Z')}
                 # make sure only integer roots and c is not diagonalisable
-                if not (len(croots) != 0 and c.is_diagonalizable) :
+                if not (len(croots) != 0 or c.is_diagonalizable()) :
                     a = c
                     pmat = pascalmat(rowcol)
                     # multiply by a pascal matrix to get a similar matrix with nice numbers