# -*- coding: utf-8 -*-

from sympy import Symbol
 
a = Symbol('a',real=True)
b = Symbol('b',real=True)
c = Symbol('c',real=True)
d = Symbol('d',real=True) 
e = Symbol('e',real=True)
f = Symbol('f',real=True)
 

t = Symbol('t',real=True)
T = Symbol('T',real=True)
tau = Symbol('tau',real=True)
x = Symbol('x',real=True)
y = Symbol('y',real=True)
t1 = Symbol('t1', real=True)
t2 = Symbol('t2', real=True)
t3 = Symbol('t3', real=True)
tau1 = Symbol('tau1',real=True)
tau2 = Symbol('tau2',real=True)
tau3 = Symbol('tau3',real=True)