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diff --git a/third_party/eigen3/Eigen/src/SparseLU/SparseLU_relax_snode.h b/third_party/eigen3/Eigen/src/SparseLU/SparseLU_relax_snode.h
deleted file mode 100644
index 58ec32e27e..0000000000
--- a/third_party/eigen3/Eigen/src/SparseLU/SparseLU_relax_snode.h
+++ /dev/null
@@ -1,83 +0,0 @@
-// This file is part of Eigen, a lightweight C++ template library
-// for linear algebra.
-//
-// Copyright (C) 2012 Désiré Nuentsa-Wakam <desire.nuentsa_wakam@inria.fr>
-//
-// This Source Code Form is subject to the terms of the Mozilla
-// Public License v. 2.0. If a copy of the MPL was not distributed
-// with this file, You can obtain one at http://mozilla.org/MPL/2.0/.
-
-/* This file is a modified version of heap_relax_snode.c file in SuperLU
- * -- SuperLU routine (version 3.0) --
- * Univ. of California Berkeley, Xerox Palo Alto Research Center,
- * and Lawrence Berkeley National Lab.
- * October 15, 2003
- *
- * Copyright (c) 1994 by Xerox Corporation.  All rights reserved.
- *
- * THIS MATERIAL IS PROVIDED AS IS, WITH ABSOLUTELY NO WARRANTY
- * EXPRESSED OR IMPLIED.  ANY USE IS AT YOUR OWN RISK.
- *
- * Permission is hereby granted to use or copy this program for any
- * purpose, provided the above notices are retained on all copies.
- * Permission to modify the code and to distribute modified code is
- * granted, provided the above notices are retained, and a notice that
- * the code was modified is included with the above copyright notice.
- */
-
-#ifndef SPARSELU_RELAX_SNODE_H
-#define SPARSELU_RELAX_SNODE_H
-
-namespace Eigen {
-
-namespace internal {
- 
-/** 
- * \brief Identify the initial relaxed supernodes
- * 
- * This routine is applied to a column elimination tree. 
- * It assumes that the matrix has been reordered according to the postorder of the etree
- * \param n  the number of columns
- * \param et elimination tree 
- * \param relax_columns Maximum number of columns allowed in a relaxed snode 
- * \param descendants Number of descendants of each node in the etree
- * \param relax_end last column in a supernode
- */
-template <typename Scalar, typename Index>
-void SparseLUImpl<Scalar,Index>::relax_snode (const Index n, IndexVector& et, const Index relax_columns, IndexVector& descendants, IndexVector& relax_end)
-{
-  
-  // compute the number of descendants of each node in the etree
-  Index j, parent; 
-  relax_end.setConstant(emptyIdxLU);
-  descendants.setZero();
-  for (j = 0; j < n; j++) 
-  {
-    parent = et(j);
-    if (parent != n) // not the dummy root
-      descendants(parent) += descendants(j) + 1;
-  }
-  // Identify the relaxed supernodes by postorder traversal of the etree
-  Index snode_start; // beginning of a snode 
-  for (j = 0; j < n; )
-  {
-    parent = et(j);
-    snode_start = j; 
-    while ( parent != n && descendants(parent) < relax_columns ) 
-    {
-      j = parent; 
-      parent = et(j);
-    }
-    // Found a supernode in postordered etree, j is the last column 
-    relax_end(snode_start) = j; // Record last column
-    j++;
-    // Search for a new leaf
-    while (descendants(j) != 0 && j < n) j++;
-  } // End postorder traversal of the etree
-  
-}
-
-} // end namespace internal
-
-} // end namespace Eigen
-#endif