Hi, I have been spending some time on
https://github.com/sympy/sympy/issues/27586 and am taking the approach of
adding rules for each integration formula. However, this seems inefficient
and there has to be a more efficient way.
My approach:
@dataclass
class ErfExpRule(AtomicRule):
a: Expr
b: Expr
def eval(self) -> Expr:
a, b, x = self.a, self.b, self.variable
return (1/b) * exp(b*x) * erf(a*x) - (1/b) * exp(b**2 / (4*a**2)) *
erf(a*x - b/(2*a))
Adding (Mul, erf(a*_symbol, evaluate=False) * exp(b*_symbol,
evaluate=False), None, ErfExpRule) to _special_function_patterns.extend
Thank you.
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