diff --git a/.gitmodules b/.gitmodules
new file mode 100644
index 0000000..8b4a671
--- /dev/null
+++ b/.gitmodules
@@ -0,0 +1,3 @@
+[submodule "math4610"]
+	path = class
+	url = https://github.com/jvkoebbe/math4610
diff --git a/class b/class
new file mode 160000
index 0000000..0c4f1d7
--- /dev/null
+++ b/class
@@ -0,0 +1 @@
+Subproject commit 0c4f1d7f0e438fe37a9c5ae5cc67743233997042
diff --git a/homeworks/hw-2.org b/homeworks/hw-2.org
index 90807b6..9dad2d3 100644
--- a/homeworks/hw-2.org
+++ b/homeworks/hw-2.org
@@ -9,7 +9,7 @@
 Computing $\epsilon_{\text{mac}}$ for single precision numbers
 
 #+BEGIN_SRC lisp :session t :results table 
-  (load "../cl/lizfcm.asd")
+  (load "../lizfcm.asd")
   (ql:quickload :lizfcm)
 
   (let ((domain-values (lizfcm.approx:compute-maceps (lambda (x) x)
diff --git a/cl/lizfcm.asd b/lizfcm.asd
similarity index 100%
rename from cl/lizfcm.asd
rename to lizfcm.asd
diff --git a/cl/src/approx/derivative.lisp b/src/approx/derivative.lisp
similarity index 100%
rename from cl/src/approx/derivative.lisp
rename to src/approx/derivative.lisp
diff --git a/cl/src/approx/maceps.lisp b/src/approx/maceps.lisp
similarity index 100%
rename from cl/src/approx/maceps.lisp
rename to src/approx/maceps.lisp
diff --git a/cl/src/approx/package.lisp b/src/approx/package.lisp
similarity index 100%
rename from cl/src/approx/package.lisp
rename to src/approx/package.lisp
diff --git a/cl/src/package.lisp b/src/package.lisp
similarity index 100%
rename from cl/src/package.lisp
rename to src/package.lisp
diff --git a/cl/src/utils/package.lisp b/src/utils/package.lisp
similarity index 100%
rename from cl/src/utils/package.lisp
rename to src/utils/package.lisp
diff --git a/cl/src/utils/table.lisp b/src/utils/table.lisp
similarity index 100%
rename from cl/src/utils/table.lisp
rename to src/utils/table.lisp
diff --git a/cl/src/utils/within-range.lisp b/src/utils/within-range.lisp
similarity index 100%
rename from cl/src/utils/within-range.lisp
rename to src/utils/within-range.lisp
diff --git a/cl/src/vector/distance.lisp b/src/vector/distance.lisp
similarity index 100%
rename from cl/src/vector/distance.lisp
rename to src/vector/distance.lisp
diff --git a/cl/src/vector/norm.lisp b/src/vector/norm.lisp
similarity index 100%
rename from cl/src/vector/norm.lisp
rename to src/vector/norm.lisp
diff --git a/cl/src/vector/package.lisp b/src/vector/package.lisp
similarity index 100%
rename from cl/src/vector/package.lisp
rename to src/vector/package.lisp
diff --git a/cl/tests/approx.lisp b/tests/approx.lisp
similarity index 100%
rename from cl/tests/approx.lisp
rename to tests/approx.lisp
diff --git a/cl/tests/maceps.lisp b/tests/maceps.lisp
similarity index 100%
rename from cl/tests/maceps.lisp
rename to tests/maceps.lisp
diff --git a/cl/tests/suite.lisp b/tests/suite.lisp
similarity index 100%
rename from cl/tests/suite.lisp
rename to tests/suite.lisp
diff --git a/cl/tests/table.lisp b/tests/table.lisp
similarity index 100%
rename from cl/tests/table.lisp
rename to tests/table.lisp
diff --git a/cl/tests/vector.lisp b/tests/vector.lisp
similarity index 100%
rename from cl/tests/vector.lisp
rename to tests/vector.lisp