From: Michael Orlitzky <michael@orlitzky.com>
Date: Mon, 19 Oct 2020 14:25:20 +0000 (-0400)
Subject: Revert "eja: start experiment full_spectral_decomposition() method."
X-Git-Url: http://gitweb.michael.orlitzky.com/?a=commitdiff_plain;h=e677f9cfc5fc73be3d7f1fdf5088c1a1f370783b;p=sage.d.git

Revert "eja: start experiment full_spectral_decomposition() method."

This reverts commit 6d32150d3f7c175473a1d590facce1ea7c5ca77a.
I don't think this will ever work reliably.
---

diff --git a/mjo/eja/eja_element.py b/mjo/eja/eja_element.py
index 2976a38..da4b123 100644
--- a/mjo/eja/eja_element.py
+++ b/mjo/eja/eja_element.py
@@ -1238,37 +1238,6 @@ class FiniteDimensionalEuclideanJordanAlgebraElement(IndexedFreeModuleElement):
             result.append( (evalue, proj(A.one()).superalgebra_element()) )
         return result
 
-    def full_spectral_decomposition(self):
-        if self.is_zero():
-            # Following the convention that the empty sum is the
-            # algebra's additive identity.
-            return []
-
-        A = self.subalgebra_generated_by(orthonormalize_basis=True)
-        if A.dimension() == 1:
-            # I'm a scalar multiple of the identity element
-            s = self.norm() / A.one().norm()
-            return [(s, self * ~s)]
-
-        result = []
-        for (evalue, proj) in A(self).operator().spectral_decomposition():
-            c = proj(A.one()).superalgebra_element()
-
-            # We know that "c" here is idempotent, so the only question is
-            # whether or not it can be decomposed further.
-            if c.is_primitive_idempotent():
-                result.append( (evalue, c) )
-            else:
-                for b in A.gens():
-                    b_decomp = b.full_spectral_decomposition()
-                    if len(b_decomp) > 1:
-                        for (a,y) in b_decomp:
-                            y_sup = y.superalgebra_element()
-                            eigenvecs = [ r[1] for r in result ]
-                            if not y_sup in eigenvecs:
-                                result.append( ( evalue*a, y_sup) )
-        return result
-
     def subalgebra_generated_by(self, orthonormalize_basis=False):
         """
         Return the associative subalgebra of the parent EJA generated