[L1-1] Replace IPython -> Jupyter; add link to next notebook

lessons/01_phugoid/01_01_Phugoid_Theory.ipynb

@@ -20,7 +20,7 @@
    "source": [
     "Welcome to [**\"Practical Numerical Methods with Python!\"**](http://openedx.seas.gwu.edu/courses/GW/MAE6286/2014_fall/about) This course is a collaborative, online, open education project, where we aim to give a foundation in scientific computing. The focus is on numerical solution of problems modeled by ordinary and partial differential equations.\n",
     "\n",
-    "This IPython Notebook introduces the problem we'll be studying in the **first module** of the course: the _phugoid model of glider flight_. We'll start with some background, explaining the physics, and working out the mathematical model. \n",
+    "This Jupyter Notebook introduces the problem we'll be studying in the **first module** of the course: the _phugoid model of glider flight_. We'll start with some background, explaining the physics, and working out the mathematical model. \n",
     "\n",
     "First, we'll look at an idealized motion where there is no drag, resulting in a simple harmonic motion. We can plot some interesting trajectories that will pique your imagination. In the next notebook, you'll learn to numerically integrate the differential equation using Euler's method. But hang on ... first things first. \n",
     "\n",
@@ -382,7 +382,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "As we mentioned, we wrote a Python code to reproduce programmatically what Lanchester did graphically. Here's a neat feature of IPython Notebooks: you can run external programs with the magical keyword ... wait for it ... `run`. And the jargon of IPython _is_ to call this \"magic.\" In fact, there are a bunch of [magic functions](https://ipython.readthedocs.io/en/stable/interactive/index.html) that you will learn about. They will make you a happy camper.\n",
+    "As we mentioned, we wrote a Python code to reproduce programmatically what Lanchester did graphically. Here's a neat feature of Jupyter Notebooks: you can run external programs with the magical keyword ... wait for it ... `run`. And the jargon of Jupyter _is_ to call this \"magic.\" In fact, there are a bunch of [magic functions](https://ipython.readthedocs.io/en/stable/interactive/index.html) that you will learn about. They will make you a happy camper.\n",
     "\n",
     "Let's do it:"
    ]
@@ -557,7 +557,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "In the next notebook of this series, we'll look at the differential equation that arises when you consider small perturbations on the horizontal phugoid, and we'll learn to numerically integrate that to get the flight paths."
+    "In the [next notebook](https://nbviewer.jupyter.org/github/numerical-mooc/numerical-mooc/blob/master/lessons/01_phugoid/01_02_Phugoid_Oscillation.ipynb) of this series, we'll look at the differential equation that arises when you consider small perturbations on the horizontal phugoid, and we'll learn to numerically integrate that to get the flight paths."
    ]
   },
   {