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2. Positional notation - Wikipedia

   en.wikipedia.org/wiki/Positional_notation

   A digit's value is the digit multiplied by the value of its place. Place values are the number of the base raised to the nth power, where n is the number of other digits between a given digit and the radix point.

3. Free variables and bound variables - Wikipedia

   en.wikipedia.org/wiki/Free_variables_and_bound...

   A free variable is a notation (symbol) that specifies places in an expression where substitution may take place and is not a parameter of this or any container expression. The idea is related to a placeholder (a symbol that will later be replaced by some value), or a wildcard character that stands for an unspecified symbol.

4. Tally marks - Wikipedia

   en.wikipedia.org/wiki/Tally_marks

   Tally marks on a chalkboard Counting using tally marks at Hanakapiai Beach.The number shown is 82. Tally marks, also called hash marks, are a form of numeral used for counting.

5. Engineering notation - Wikipedia

   en.wikipedia.org/wiki/Engineering_notation

   Engineering notation or engineering form (also technical notation) is a version of scientific notation in which the exponent of ten is always selected to be divisible by three to match the common metric prefixes, i.e. scientific notation that aligns with powers of a thousand, for example, 531×10 3 instead of 5.31×10 5 (but on calculator displays written without the ×10 to save space).

6. Free body diagram - Wikipedia

   en.wikipedia.org/wiki/Free_body_diagram

   In physics and engineering, a free body diagram (FBD; also called a force diagram) [1] is a graphical illustration used to visualize the applied forces, moments, and resulting reactions on a free body in a given condition. It depicts a body or connected bodies with all the applied forces and moments, and reactions, which act on the body(ies).

7. Curve fitting - Wikipedia

   en.wikipedia.org/wiki/Curve_fitting

   Fitting of a noisy curve by an asymmetrical peak model, with an iterative process (Gauss–Newton algorithm with variable damping factor α).Curve fitting [1] [2] is the process of constructing a curve, or mathematical function, that has the best fit to a series of data points, [3] possibly subject to constraints.