Minor changes

source/calculus/notations.rst

@@ -0,0 +1,21 @@
+Differentiation Notations
+================================
+
+
+Leibniz's Notation
+-------------------
+https://www.me.psu.edu/cimbala/me420/Homework/dydx_quotient_article.html
+
+Lagrange's Notation
+-------------------
+Also cal prime notation
+
+Newton's Notation
+-------------------
+
+
+.. note::
+   These notes are inspired from `this page <https://byjus.com/maths/ordinary-differential-equations/>`__
+
+
+

source/calculus/ode.rst

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+Ordinary Differential Equations
+================================
+
+- An Ordinary Differential Equations (ODE) is a differential equation that involves a single independant variable and its derivatives.
+
+- The order of a ODE is define as the order of the highest derivative that occurs in the equation.
+
+`Original Source <https://byjus.com/maths/ordinary-differential-equations/>`__
+
+.. note::
+   When working with differential equations with often use the Lagrange's notation (see :doc:`notations`).
+

source/index.rst

@@ -40,6 +40,14 @@ Welcome to ScienceNotes's documentation!
    electronics/superposition.rst
    electronics/thevnort.rst
 
+.. toctree::
+   :maxdepth: 2
+   :numbered:
+   :caption: Calculus
+
+   calculus/notations.rst
+   calculus/ode.rst
+
 
 Indices and tables
 ==================