Show that the function 
satisfies the diffusion equation 
.
Definitions:
Annuitant
The individual entitled to receive payments from an annuity contract, usually during retirement.
Annually Compounded
A compound interest calculation where the interest is added to the principal at the end of each year.
Nominal Rate
The stated interest rate of a bond or loan, without accounting for compounding or inflation.
Mortgage Loan
A loan secured by real property through the use of a mortgage note which evidences the existence of the loan and the encumbrance of that realty.
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