Removed the white background around the box by making a PDF first the…

…n convert the same to PNG using ImageMagick convert.
avalon-lang · Nov 14, 2018 · 781075e · 781075e
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diff --git a/source/_diagrams/deutsch/classical.pdf b/source/_diagrams/deutsch/classical.pdf
diff --git a/source/_diagrams/deutsch/classical.png b/source/_diagrams/deutsch/classical.png
diff --git a/source/algorithms/deutsch.rst b/source/algorithms/deutsch.rst
@@ -74,15 +74,14 @@ make our decision of whether we have a balanced or constant oracle.
 
 We can visualize the classical algorithm running as shown below.
 
+.. _classical_solution:
 .. figure:: /_diagrams/deutsch/classical.png
     :scale: 40%
     :align: center
     :alt: Classical solution to Deutsch problem
 
     Classical algorithm executing the oracle :math:`f`.
 
-    :math:`|x\rangle` is the input and :math:`|f(x)\rangle` is the output.
-
 
 So how many times exactly do we need to call the oracle here?