diff --git a/Data/Natural/Class.hs b/Data/Natural/Class.hs
new file mode 100644
--- /dev/null
+++ b/Data/Natural/Class.hs
@@ -0,0 +1,12 @@
+module Data.Natural.Class where
+
+import Data.Peano
+
+class Natural n where
+    natural :: f Zero -> (∀ m . Natural m => f (Succ m)) -> f n
+
+instance Natural Zero where
+    natural zf _ = zf
+
+instance Natural n => Natural (Succ n) where
+    natural _ sf = sf
diff --git a/LICENSE b/LICENSE
new file mode 100644
--- /dev/null
+++ b/LICENSE
@@ -0,0 +1,30 @@
+Copyright (c) 2017, M Farkas-Dyck
+
+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.
+
+    * Neither the name of M Farkas-Dyck nor the names of other
+      contributors may be used to endorse or promote products derived
+      from this software without specific prior written permission.
+
+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
+OWNER 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.
diff --git a/Setup.hs b/Setup.hs
new file mode 100644
--- /dev/null
+++ b/Setup.hs
@@ -0,0 +1,2 @@
+import Distribution.Simple
+main = defaultMain
diff --git a/natural-induction.cabal b/natural-induction.cabal
new file mode 100644
--- /dev/null
+++ b/natural-induction.cabal
@@ -0,0 +1,24 @@
+name:                natural-induction
+version:             0.1.0.0
+synopsis:            Induction over natural numbers
+-- description:         
+license:             BSD3
+license-file:        LICENSE
+author:              M Farkas-Dyck
+maintainer:          strake888@gmail.com
+-- copyright:           
+category:            Math
+build-type:          Simple
+cabal-version:       >=1.10
+
+library
+  exposed-modules:     Data.Natural.Class
+  -- other-modules:       
+  build-depends:       base >=4.9 && <5
+                     , peano >=0.1 && <0.2
+  -- hs-source-dirs:      
+  default-language:    Haskell2010
+  default-extensions:  UnicodeSyntax
+                     , RankNTypes
+                     , DataKinds
+  -- other-extensions: