Update 1_einstein_model.md - prior knowledge

src/1_einstein_model.md

@@ -32,6 +32,14 @@ py.init_notebook_mode(connected=True)
 
 _(based on chapter 2.1 of the book)_
 
+!!! summary "Expected prior knowledge"
+
+    Before the start of this lecture, you should be able to:
+
+    - Describe the energy spectrum of a quantum harmonic oscillator and derive its partition function
+    - Write down the Bose-Einstein distribution 
+
+
 !!! summary "Learning goals"
 
     After this lecture you will be able to: