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  2. Continuous-repayment mortgage - Wikipedia

    en.wikipedia.org/wiki/Continuous-repayment_mortgage

    Define the "reverse time" variable z = T − t.(t = 0, z = T and t = T, z = 0).Then: Plotted on a time axis normalized to system time constant (τ = 1/r years and τ = RC seconds respectively) the mortgage balance function in a CRM (green) is a mirror image of the step response curve for an RC circuit (blue).The vertical axis is normalized to system asymptote i.e. perpetuity value M a /r for ...

  3. Vasicek model - Wikipedia

    en.wikipedia.org/wiki/Vasicek_model

    The model specifies that the instantaneous interest rate follows the stochastic differential equation: d r t = a ( b − r t ) d t + σ d W t {\displaystyle dr_{t}=a(b-r_{t})\,dt+\sigma \,dW_{t}} where W t is a Wiener process under the risk neutral framework modelling the random market risk factor, in that it models the continuous inflow of ...

  4. Finite difference methods for option pricing - Wikipedia

    en.wikipedia.org/wiki/Finite_difference_methods...

    The discrete difference equations may then be solved iteratively to calculate a price for the option. [4] The approach arises since the evolution of the option value can be modelled via a partial differential equation (PDE), as a function of (at least) time and price of underlying; see for example the Black–Scholes PDE. Once in this form, a ...

  5. Mathematical finance - Wikipedia

    en.wikipedia.org/wiki/Mathematical_finance

    The fundamental theorem of arbitrage-free pricing is one of the key theorems in mathematical finance, while the Black–Scholes equation and formula are amongst the key results. [3] Today many universities offer degree and research programs in mathematical finance.

  6. Matrix exponential - Wikipedia

    en.wikipedia.org/wiki/Matrix_exponential

    It is used to solve systems of linear differential equations. In the theory of Lie groups, the matrix exponential gives the exponential map between a matrix Lie algebra and the corresponding Lie group. Let X be an n×n real or complex matrix. The exponential of X, denoted by e X or exp(X), is the n×n matrix given by the power series = =!

  7. Cox–Ingersoll–Ross model - Wikipedia

    en.wikipedia.org/wiki/Cox–Ingersoll–Ross_model

    Three trajectories of CIR processes. In mathematical finance, the Cox–Ingersoll–Ross (CIR) model describes the evolution of interest rates.It is a type of "one factor model" (short-rate model) as it describes interest rate movements as driven by only one source of market risk.

  8. Stochastic calculus - Wikipedia

    en.wikipedia.org/wiki/Stochastic_calculus

    An important application of stochastic calculus is in mathematical finance, in which asset prices are often assumed to follow stochastic differential equations.For example, the Black–Scholes model prices options as if they follow a geometric Brownian motion, illustrating the opportunities and risks from applying stochastic calculus.

  9. Black–Derman–Toy model - Wikipedia

    en.wikipedia.org/wiki/Black–Derman–Toy_model

    Once solved, retain these known short rates, and proceed to the next time-step (i.e. input spot-rate), "growing" the tree until it incorporates the full input yield-curve. In mathematical finance , the Black–Derman–Toy model ( BDT ) is a popular short-rate model used in the pricing of bond options , swaptions and other interest rate ...