diff --git a/eo/contrib/mathsym/eo_interface/eoSymLambdaMutate.cpp b/eo/contrib/mathsym/eo_interface/eoSymLambdaMutate.cpp
new file mode 100644
index 00000000..e7eeecf5
--- /dev/null
+++ b/eo/contrib/mathsym/eo_interface/eoSymLambdaMutate.cpp
@@ -0,0 +1,29 @@
+#include <eoSymLambdaMutate.h>
+#include "FunDef.h"
+#include "NodeSelector.h"
+
+Sym compress(Sym sym, NodeSelector& sel) {
+    
+    return ::compress(sym);
+    
+    NodeSelector::NodeSelection s = sel.select_node(sym);
+    
+    Sym f = SymLambda( s.subtree());
+    
+    if (f == s.subtree()) { return sym; }
+    
+    return insert_subtree(sym, s.idx(), f);
+}
+
+extern Sym expand(Sym sym, NodeSelector& sel) {
+
+    return ::expand_all(sym);
+    
+    NodeSelector::NodeSelection s = sel.select_node(sym);
+    
+    Sym f = SymUnlambda( s.subtree());
+    
+    if (f == s.subtree()) { return sym; }
+    
+    return insert_subtree(sym, s.idx(), f);
+}