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2. The Geometer's Sketchpad - Wikipedia

   en.wikipedia.org/wiki/The_Geometer's_Sketchpad

   The Geometer's Sketchpad is a commercial interactive geometry software program for exploring Euclidean geometry, algebra, calculus, and other areas of mathematics.It was created as part of the NSF-funded Visual Geometry Project led by Eugene Klotz and Doris Schattschneider from 1986 to 1991 at Swarthmore College. [1]

3. List of dimensionless quantities - Wikipedia

   en.wikipedia.org/wiki/List_of_dimensionless...

   mathematics (ratio of a circle's circumference to its diameter) Radian measure: rad / mathematics (measurement of planar angles, 1 radian = 180/π degrees) Steradian measure: sr: measurement of solid angles

4. Measure (mathematics) - Wikipedia

   en.wikipedia.org/wiki/Measure_(mathematics)

   A simple example is a volume (how big an object occupies a space) as a measure. In mathematics, the concept of a measure is a generalization and formalization of geometrical measures (length, area, volume) and other common notions, such as magnitude, mass, and probability of events. These seemingly distinct concepts have many similarities and ...

5. Mathematical instrument - Wikipedia

   en.wikipedia.org/wiki/Mathematical_instrument

   Animation of construction of a pentagon using a compass and straightedge. A mathematical instrument is a tool or device used in the study or practice of mathematics.In geometry, construction of various proofs was done using only a compass and straightedge; arguments in these proofs relied only on idealized properties of these instruments and literal construction was regarded as only an ...

6. Dimensional metrology - Wikipedia

   en.wikipedia.org/wiki/Dimensional_metrology

   Standardized measurements are essential to technological advancement, and early measurement tools have been found dating back to the dawn of human civilization. [1] Early Mesopotamian and Egyptian metrologists created a set of measurement standards based on body parts known as anthropic units. These ancient systems of measurements utilized ...

7. Counting measure - Wikipedia

   en.wikipedia.org/wiki/Counting_measure

   The counting measure can be defined on any measurable space (that is, any set along with a sigma-algebra) but is mostly used on countable sets. [ 1 ] In formal notation, we can turn any set X {\displaystyle X} into a measurable space by taking the power set of X {\displaystyle X} as the sigma-algebra Σ ; {\displaystyle \Sigma ;} that is, all ...