Better instuctions for running docs notebooks.

docs/fun_with_scan.ipynb

@@ -2,7 +2,7 @@
  "cells": [
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+   "execution_count": 2,
    "metadata": {},
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    "source": [
@@ -15,7 +15,9 @@
    "source": [
     "# On \"Two Exercises Found in a Book on Algorithmics\"\n",
     "\n",
-    "Bird & Meertens"
+    "Bird & Meertens\n",
+    "\n",
+    "[PDF paper available here](https://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.694.2614)"
    ]
   },
   {
@@ -30,7 +32,7 @@
     "\n",
     "> The problem is to find some definition of `scan` as a reduction.  In other words, we have to find some function `f` and an operator `⨂` so that\n",
     "\n",
-    "    ⨂\\x = f(a)⨂f(b)⨂...⨂f(z)"
+    "    ⨁\\x = f(a)⨂f(b)⨂...⨂f(z)"
    ]
   },
   {
@@ -153,7 +155,7 @@
   },
   {
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-   "execution_count": 2,
+   "execution_count": 3,
    "metadata": {
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@@ -179,7 +181,7 @@
   },
   {
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-   "execution_count": 3,
+   "execution_count": 4,
    "metadata": {
     "scrolled": false
    },
@@ -205,7 +207,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 4,
+   "execution_count": 5,
    "metadata": {
     "scrolled": false
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@@ -245,7 +247,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 5,
+   "execution_count": 6,
    "metadata": {},
    "outputs": [],
    "source": [
@@ -254,7 +256,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 6,
+   "execution_count": 7,
    "metadata": {},
    "outputs": [
     {
@@ -271,7 +273,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 7,
+   "execution_count": 8,
    "metadata": {},
    "outputs": [
     {
@@ -288,7 +290,7 @@
   },
   {
    "cell_type": "code",
-   "execution_count": 8,
+   "execution_count": 9,
    "metadata": {},
    "outputs": [
     {
@@ -433,7 +435,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython2",
-   "version": "2.7.15"
+   "version": "2.7.12"
   }
  },
  "nbformat": 4,