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  2. Three-valued logic - Wikipedia

    en.wikipedia.org/wiki/Three-valued_logic

    Łukasiewicz initially developed three-valued logic for the problem of future contingents to represent the truth value of statements about the undetermined future. [ 9 ] [ 10 ] [ 11 ] Bruno de Finetti used a third value to represent when "a given individual does not know the [correct] response, at least at a given moment."

  3. Calculator input methods - Wikipedia

    en.wikipedia.org/wiki/Calculator_input_methods

    The simplest example given by Thimbleby of a possible problem when using an immediate-execution calculator is 4 × (−5). As a written formula the value of this is −20 because the minus sign is intended to indicate a negative number, rather than a subtraction, and this is the way that it would be interpreted by a formula calculator.

  4. Three-way comparison - Wikipedia

    en.wikipedia.org/wiki/Three-way_comparison

    Many object-oriented programming languages have a three-way comparison function, which performs a three-way comparison between the object and another given object. For example, in Java , any class that implements the Comparable interface has a compareTo method which either returns a negative integer, zero, or a positive integer, or throws a ...

  5. Reverse Polish notation - Wikipedia

    en.wikipedia.org/wiki/Reverse_Polish_notation

    Video: Keys pressed for calculating eight times six on a HP-32SII (employing RPN) from 1991. Reverse Polish notation (RPN), also known as reverse Łukasiewicz notation, Polish postfix notation or simply postfix notation, is a mathematical notation in which operators follow their operands, in contrast to prefix or Polish notation (PN), in which operators precede their operands.

  6. Curta - Wikipedia

    en.wikipedia.org/wiki/Curta

    The Curta was conceived by Curt Herzstark in the 1930s in Vienna, Austria.By 1938, he had filed a key patent, covering his complemented stepped drum. [3] [4] This single drum replaced the multiple drums, typically around 10 or so, of contemporary calculators, and it enabled not only addition, but subtraction through nines complement math, essentially subtracting by adding.

  7. Savings calculator: Calculate the interest on your savings ...

    www.aol.com/finance/savings-calculator-calculate...

    As you make your selections, the calculator will automatically update to display your total estimated interest earnings based on a rate of 4.50% annual percentage yield (APY) compared to what you ...

  8. Lottery mathematics - Wikipedia

    en.wikipedia.org/wiki/Lottery_mathematics

    Lottery mathematics is used to calculate probabilities of winning or losing a lottery game. It is based primarily on combinatorics, particularly the twelvefold way and combinations without replacement. It can also be used to analyze coincidences that happen in lottery drawings, such as repeated numbers appearing across different draws. [1

  9. Mental calculation - Wikipedia

    en.wikipedia.org/wiki/Mental_calculation

    Example: 4075 − 1844 ----- Thousands: 4 − 1 = 3, look to right, 075 < 844, need to borrow. 3 − 1 = 2, say "Two thousand". One is performing 3 - 1 rather than 4 - 1 because the column to the right is going to borrow from the thousands place. Hundreds: 0 − 8 = negative numbers not allowed here.