Trouble in assertion

[Manoj Kumar]

Hello,

Ive been trying to add this new hint called 'separable_reduced' in ode.py

According to this,

My equation is  eq = x* df  + f(x)* (1 / (x**2*f(x) - 1)

sol = dsolve(eq, hint = 'separable_reduced) gives sol = log(x**2*f(x))/3 + log(x**2*f(x) - 3/2)/6 == C1 + log(x)

 checkodesol(eq, sol, order=1, solve_for_func=False) also gives True.

However when I do assert sol.lhs == log(x**2*f(x))/3 + log(x**2*f(x) - 3/2)/6 ,
It gives me an assertion error because the lhs becomes log(x**2*f(x))/3 + log(x**2*f(x) - 1)/6 as 3/2 = 1

I've faced this problem before. How do I overcome this?

[Chris Smith]

write S(3)/2

[Ankit Agrawal]

Even I encountered this problem once. Rational(3, 2) should solve it.

[Manoj Kumar]

S(3) does it well too? :)

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Regards,
Manoj Kumar,
Mech Undergrad.
BPGC
Blog

[Ankit Agrawal]

Yeah. It does. :)

Regards,

Ankit.