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  2. Future interest - Wikipedia

    en.wikipedia.org/wiki/Future_interest

    Analysis (O): O has a reversion (see above), since there is a one-year gap between A's estate and the succeeding estate Analysis (A): A has a possessory interest for life Analysis (B): B has a springing executory interest, since B's future interest follows the reversion to O, and if B reaches the age of 25 years after A's death B's interest ...

  3. Rule against perpetuities - Wikipedia

    en.wikipedia.org/wiki/Rule_against_perpetuities

    The rule against perpetuities serves a number of purposes. First, English courts have long recognized that allowing owners to attach long-lasting contingencies to their property harms the ability of future generations to freely buy and sell the property, since few people would be willing to buy property that had unresolved issues regarding its ownership hanging over it.

  4. Defeasible estate - Wikipedia

    en.wikipedia.org/wiki/Defeasible_estate

    The interest will revert to the grantor or the heirs of the grantor. Normally, a possibility of reverter follows a fee simple determinable. However, a possibility of reverter does not follow a fee simple determinable subject to an executory interest, because a possibility of reverter is in the grantor while an executory interest is in a third ...

  5. Reversion (law) - Wikipedia

    en.wikipedia.org/wiki/Reversion_(law)

    A reversion in property law is a future interest that is retained by the grantor after the conveyance of an estate of a lesser quantum than he has (such as the owner of a fee simple granting a life estate or a leasehold estate).

  6. Remainder (law) - Wikipedia

    en.wikipedia.org/wiki/Remainder_(law)

    In property law of the United Kingdom and the United States and other common law countries, a remainder is a future interest given to a person (who is referred to as the transferee or remainderman) that is capable of becoming possessory upon the natural end of a prior estate created by the same instrument. [1]

  7. Ho–Lee model - Wikipedia

    en.wikipedia.org/wiki/Ho–Lee_model

    As the model generates a symmetric ("bell shaped") distribution of rates in the future, negative rates are possible. Further, it does not incorporate mean reversion . For both of these reasons, models such as Black–Derman–Toy ( lognormal and mean reverting) and Hull–White (mean reverting with lognormal variant available) are often preferred.

  8. Pregnancy rate - Wikipedia

    en.wikipedia.org/wiki/Pregnancy_rate

    Pregnancy rate is the success rate for getting pregnant. It is the percentage of all attempts that leads to pregnancy, with attempts generally referring to menstrual cycles where insemination or any artificial equivalent is used, which may be simple artificial insemination (AI) or AI with additional in vitro fertilization (IVF).

  9. Cox–Ingersoll–Ross model - Wikipedia

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

    It ensures mean reversion of the interest rate towards the long run value , with speed of adjustment governed by the strictly positive parameter . The standard deviation factor, σ r t {\displaystyle \sigma {\sqrt {r_{t}}}} , avoids the possibility of negative interest rates for all positive values of a {\displaystyle a} and b {\displaystyle b} .