eja: fix an erroneous test case.

diff --git a/mjo/eja/euclidean_jordan_algebra.py b/mjo/eja/euclidean_jordan_algebra.py
index 0b50c233279ee576ea59c6953fbf5c58ca64fb35..30d04f4a352b7d553470bd456d18d224e2ec5428 100644 (file)
--- a/mjo/eja/euclidean_jordan_algebra.py
+++ b/mjo/eja/euclidean_jordan_algebra.py
@@ -1084,12 +1084,12 @@ class FiniteDimensionalEuclideanJordanAlgebra(FiniteDimensionalAlgebra):
                 sage: n = ZZ.random_element(1,10)
                 sage: J = JordanSpinEJA(n)
                 sage: x = J.random_element()
-                sage: while x.is_zero():
+                sage: while not x.is_invertible():
                 ....:     x = J.random_element()
                 sage: x_vec = x.vector()
                 sage: x0 = x_vec[0]
                 sage: x_bar = x_vec[1:]
-                sage: coeff = 1/(x0^2 - x_bar.inner_product(x_bar))
+                sage: coeff = ~(x0^2 - x_bar.inner_product(x_bar))
                 sage: inv_vec = x_vec.parent()([x0] + (-x_bar).list())
                 sage: x_inverse = coeff*inv_vec
                 sage: x.inverse() == J(x_inverse)