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2. Calculator input methods - Wikipedia

   en.wikipedia.org/wiki/Calculator_input_methods

   Calculator input methods. There are various ways in which calculators interpret keystrokes. These can be categorized into two main types: On a single-step or immediate-execution calculator, the user presses a key for each operation, calculating all the intermediate results, before the final value is shown. [1] [2] [3]

3. Time-tracking software - Wikipedia

   en.wikipedia.org/wiki/Time-tracking_software

   Time-tracking/recording software. Time-tracking/recording software automates the time-tracking process by recording the activities performed on a computer and the time spent on each of them. This software is intended to be an improvement over timesheet software.

4. HP calculators - Wikipedia

   en.wikipedia.org/wiki/HP_calculators

   Smaller programmable model with programs up to 49 steps. Version HP-25C was first calculator with "continuous memory". HP-27S: 1988 The first HP pocket calculator to use algebraic notation only rather than RPN. It was a "do all" calculator that included algebraic solver like the HP-18C, statistical, probability and time/value of money ...

5. Time complexity - Wikipedia

   en.wikipedia.org/wiki/Time_complexity

   Graphs of functions commonly used in the analysis of algorithms, showing the number of operations N as the result of input size n for each function. In theoretical computer science, the time complexity is the computational complexity that describes the amount of computer time it takes to run an algorithm. Time complexity is commonly estimated ...

6. Time constant - Wikipedia

   en.wikipedia.org/wiki/Time_constant

   In physics and engineering, the time constant, usually denoted by the Greek letter τ (tau), is the parameter characterizing the response to a step input of a first-order, linear time-invariant (LTI) system. [1] [note 1] The time constant is the main characteristic unit of a first-order LTI system. In the time domain, the usual choice to ...

7. Katherine Johnson - Wikipedia

   en.wikipedia.org/wiki/Katherine_Johnson

   Creola Katherine Johnson ( née Coleman; August 26, 1918 – February 24, 2020) was an American mathematician whose calculations of orbital mechanics as a NASA employee were critical to the success of the first and subsequent U.S. crewed spaceflights. [1] [2] During her 33-year career at NASA and its predecessor, she earned a reputation for ...