Department of Mathematics and Computer Science, Bemidji State University, Bemidji, MN 56601-2699, USA. mjwolf@whitetail.bemidji.msus.edu|Department of Mathematics and Computer Science, Bemidji State University, Bemidji, MN 56601-2699, USA. mjwolf@whitetail.bemidji.msus.edu|Department of Mathematics and Computer Science, Bemidji State University, Bemidji, MN 56601-2699, USA. mjwolf@whitetail.bemidji.msus.edu|Department of Mathematics and Computer Science, Bemidji State University, Bemidji, MN 56601-2699, USA. mjwolf@whitetail.bemidji.msus.edu|Department of Mathematics and Computer Science, Bemidji State University, Bemidji, MN 56601-2699, USA. mjwolf@whitetail.bemidji.msus.edu