From: Michael Orlitzky <michael@orlitzky.com>
Date: Tue, 20 Aug 2019 14:05:39 +0000 (-0400)
Subject: eja: add norm() and trace_norm() methods for elements.
X-Git-Url: https://gitweb.michael.orlitzky.com/?a=commitdiff_plain;h=257faa05a58651e2fbad0545c6413cc3e9203539;p=sage.d.git

eja: add norm() and trace_norm() methods for elements.
---

diff --git a/mjo/eja/eja_element.py b/mjo/eja/eja_element.py
index aef1c5d..a681ae2 100644
--- a/mjo/eja/eja_element.py
+++ b/mjo/eja/eja_element.py
@@ -829,6 +829,33 @@ class FiniteDimensionalEuclideanJordanAlgebraElement(IndexedFreeModuleElement):
         return W.linear_combination(zip(B,self.to_vector()))
 
 
+    def norm(self):
+        """
+        The norm of this element with respect to :meth:`inner_product`.
+
+        SETUP::
+
+            sage: from mjo.eja.eja_algebra import (JordanSpinEJA,
+            ....:                                  RealCartesianProductEJA)
+
+        EXAMPLES::
+
+            sage: J = RealCartesianProductEJA(2)
+            sage: x = sum(J.gens())
+            sage: x.norm()
+            sqrt(2)
+
+        ::
+
+            sage: J = JordanSpinEJA(4)
+            sage: x = sum(J.gens())
+            sage: x.norm()
+            2
+
+        """
+        return self.inner_product(self).sqrt()
+
+
     def operator(self):
         """
         Return the left-multiplication-by-this-element
@@ -1177,3 +1204,30 @@ class FiniteDimensionalEuclideanJordanAlgebraElement(IndexedFreeModuleElement):
             raise TypeError("'other' must live in the same algebra")
 
         return (self*other).trace()
+
+
+    def trace_norm(self):
+        """
+        The norm of this element with respect to :meth:`trace_inner_product`.
+
+        SETUP::
+
+            sage: from mjo.eja.eja_algebra import (JordanSpinEJA,
+            ....:                                  RealCartesianProductEJA)
+
+        EXAMPLES::
+
+            sage: J = RealCartesianProductEJA(2)
+            sage: x = sum(J.gens())
+            sage: x.trace_norm()
+            sqrt(2)
+
+        ::
+
+            sage: J = JordanSpinEJA(4)
+            sage: x = sum(J.gens())
+            sage: x.trace_norm()
+            2*sqrt(2)
+
+        """
+        return self.trace_inner_product(self).sqrt()