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limit condition for pde bs

Hi would to like to solve a PDE (exact or num) for the black & scholes
model. it is
D1(t) f(s,t)+r*s*D1(s)f(s,t)+0.5*b^2*s^2*D2(s)f(s,t)=r*f(s,t)
But i dont know how to put this final condition

lim f(s,t)-s=const. when s goes to + Inf.

any suggest?



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