diff --git a/src/Complex/arithmetic.ts b/src/Complex/arithmetic.ts
index 0987779..a9d0d42 100644
--- a/src/Complex/arithmetic.ts
+++ b/src/Complex/arithmetic.ts
@@ -56,10 +56,10 @@ export const multiply =
       }
 
 export const absquare =
-   <T>(dep: {
-      add: FnAdd<T>,
-      absquare: FnAbsSquare<T, T>
-   }): FnAbsSquare<Complex<T>, T> =>
+   <T, U>(dep: {
+      add: FnAdd<U>,
+      absquare: FnAbsSquare<T, U>
+   }): FnAbsSquare<Complex<T>, U> =>
       (z) => dep.add(dep.absquare(z.re), dep.absquare(z.im))
 
 export const divideByReal =
diff --git a/src/index.ts b/src/index.ts
index bb83486..297b271 100644
--- a/src/index.ts
+++ b/src/index.ts
@@ -2,3 +2,19 @@ import {Dispatcher} from './core/Dispatcher.js'
 import * as Specifications from './all.js'
 
 export default new Dispatcher(Specifications)
+
+import {Complex} from './Complex/type.js'
+import {absquare as absquare_complex} from './Complex/arithmetic.js'
+
+const mockRealAdd = (a: number, b: number) => a+b
+const mockComplexAbsquare = (z: Complex<number>) => z.re*z.re + z.im*z.im
+
+const quatAbsquare = absquare_complex({
+    add: mockRealAdd,
+    absquare: mockComplexAbsquare
+})
+
+const myabs = quatAbsquare({re: {re: 0, im: 1}, im: {re:2, im: 3}})
+const typeTest: typeof myabs = 7 // check myabs is just a number
+
+console.log('Result is', myabs)