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diff --git a/src/math.cc b/src/math.cc
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+++ b/src/math.cc
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+
+/*******************************************************************************
+
+ Copyright (c) 2009, Charles McGarvey
+ All rights reserved.
+ 
+ Redistribution   and   use  in  source  and  binary  forms,  with  or  without
+ modification, are permitted provided that the following conditions are met:
+ 
+   * Redistributions  of  source  code  must retain the above copyright notice,
+     this list of conditions and the following disclaimer.
+   * Redistributions  in binary form must reproduce the above copyright notice,
+     this  list of conditions and the following disclaimer in the documentation
+     and/or other materials provided with the distribution.
+ 
+ THIS  SOFTWARE  IS  PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ AND  ANY  EXPRESS  OR  IMPLIED  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ DISCLAIMED.  IN  NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ FOR  ANY  DIRECT,  INDIRECT,  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ DAMAGES  (INCLUDING,  BUT  NOT  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ SERVICES;  LOSS  OF  USE,  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ CAUSED  AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ OR  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+*******************************************************************************/
+
+#include "math.hh"
+#include "vector.hh"
+#include "matrix.hh"
+
+
+namespace dc {
+
+
+vector2 vector2::zero(0.0, 0.0);
+vector3 vector3::zero(0.0, 0.0, 0.0);
+
+matrix3 matrix3::zero(0.0, 0.0, 0.0,
+					  0.0, 0.0, 0.0,
+					  0.0, 0.0, 0.0);
+matrix3 matrix3::identity(1.0, 0.0, 0.0,
+						  0.0, 1.0, 0.0,
+						  0.0, 0.0, 1.0);
+
+matrix4 matrix4::zero(0.0, 0.0, 0.0, 0.0,
+					  0.0, 0.0, 0.0, 0.0,
+					  0.0, 0.0, 0.0, 0.0,
+					  0.0, 0.0, 0.0, 0.0);
+matrix4 matrix4::identity(1.0, 0.0, 0.0, 0.0,
+						  0.0, 1.0, 0.0, 0.0,
+						  0.0, 0.0, 1.0, 0.0,
+						  0.0, 0.0, 0.0, 1.0);
+
+
+} // namespace dc
+