Add, subtract, multiply, or divide optimization objectives.
# S4 method for class 'Objective,numeric'
e1 + e2
# S4 method for class 'numeric,Objective'
e1 + e2
# S4 method for class 'Minimize,missing'
e1 - e2
# S4 method for class 'Minimize,Minimize'
e1 + e2
# S4 method for class 'Minimize,Maximize'
e1 + e2
# S4 method for class 'Objective,Minimize'
e1 - e2
# S4 method for class 'Objective,Maximize'
e1 - e2
# S4 method for class 'Minimize,Objective'
e1 - e2
# S4 method for class 'Maximize,Objective'
e1 - e2
# S4 method for class 'Objective,numeric'
e1 - e2
# S4 method for class 'numeric,Objective'
e1 - e2
# S4 method for class 'Minimize,numeric'
e1 * e2
# S4 method for class 'Maximize,numeric'
e1 * e2
# S4 method for class 'numeric,Minimize'
e1 * e2
# S4 method for class 'numeric,Maximize'
e1 * e2
# S4 method for class 'Objective,numeric'
e1/e2
# S4 method for class 'Maximize,missing'
e1 - e2
# S4 method for class 'Maximize,Maximize'
e1 + e2
# S4 method for class 'Maximize,Minimize'
e1 + e2