The model contains two varying parameters called S1 and S2 and two constant parameters called k1 and k2. (Note that indeed S1 and S2 are parameters and not species in this model.)

The model contains two rules:

Type Variable Formula
Algebraic add(S1, add(S2, −k1))
Rate S1 multiply(k2, S2)

The model contains two functionDefinitions defined as:

Id Arguments Formula
multiply x, y x · y
add x, y x + y

The initial conditions are as follows:

Value Units
Value of parameter S1 0.5 any
Value of parameter S2 0.5 same as S1
Value of parameter k1 1.0 same as S1
Value of parameter k2 0.8 second-1