add izhikevich

Author: jessica-mitchell

models/izhikevich.h

@@ -34,7 +34,7 @@
 namespace nest
 {
 
-/* BeginUserDocs: neuron, integrate-and-fire
+/* BeginUserDocs: neuron, integrate-and-fire, adaptation
 
 Short description
 +++++++++++++++++
@@ -49,7 +49,7 @@ Implementation of the simple spiking neuron model introduced by Izhikevich
 
 .. math::
    &dV_m/dt = 0.04 {V_m}^2 + 5 V_m + 140 - U_m + I \\
-   &du/dt = a (b V_m - U_m) \\
+   &dU_m/dt = a (b V_m - U_m) \\
 
 .. math::