Abstract
This paper presents the use of base value (⊥) for financial and actuarial calculations involving present (discounted) value and future (accumulated) value, annuities certain (both immediate and due), life annuities, and amortization. Base value can perform these calculations at either constant or varying interest. Simultaneous evaluation of various possible streams of payments under each of several scenarios of varying interest rates can be performed by a single ⊥ with matrix (or higher rank) arrays for both left and right arguments.
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