def test_mrv_leadterm2():
#Gruntz: p51, 3.25
assert mrv_leadterm((log(exp(x)+x)-x)/log(exp(x)+log(x))*exp(x), x) == \
(1, 0)
def test_mrv_leadterm3():
#Gruntz: p56, 3.27
assert mrv(exp(-x+exp(-x)*exp(-x*log(x))), x) == set([exp(-x-x*log(x))])
assert mrv_leadterm(exp(-x+exp(-x)*exp(-x*log(x))), x) == (exp(-x), 0)
def test_mrv_leadterm1():
assert mrv_leadterm(-exp(1/x), x) == (-1, 0)
assert mrv_leadterm(1/exp(-x+exp(-x))-exp(x), x) == (-1, 0)
assert mrv_leadterm((exp(1/x-exp(-x))-exp(1/x))*exp(x), x) == (-exp(1/x), 0)