diff --git a/example/ex10.c b/example/ex10.c
new file mode 100644
index 00000000..72b64326
--- /dev/null
+++ b/example/ex10.c
@@ -0,0 +1,32 @@
+#include <gmp.h>
+
+#include "m-array.h"
+#include "m-algo.h"
+
+ARRAY_DEF(mpz, mpz_t, M_CLASSIC_OPLIST(mpz))
+ALGO_DEF(array_mpz, ARRAY_OPLIST(mpz, M_CLASSIC_OPLIST(mpz)))
+
+static inline void my_mpz_inc(mpz_t d, const mpz_t a){
+  mpz_add(d, d, a);
+}
+static inline void my_mpz_sqr(mpz_t d, const mpz_t a){
+  mpz_mul(d, a, a);
+}
+
+int main(void)
+{
+  mpz_t z;
+  mpz_init_set_ui(z, 1);
+  array_mpz_t a;
+  array_mpz_init(a);
+  array_mpz_push_back(a, z);
+  for(size_t i = 2 ; i < 1000; i++) {
+    mpz_mul_ui(z, z, i);
+    array_mpz_push_back(a, z);    
+  }
+  /* z = sum (a[i]^2) */
+  array_mpz_map_reduce (&z, a, my_mpz_inc, my_mpz_sqr);
+  gmp_printf ("Z=%Zd\n", z);
+  array_mpz_clear(a);
+  mpz_clear(z);
+}