A benchmark is number, a few numbers of a list of numbers used to estimate something. For example, you want to know what 29 divided by 6 is. You know that 6 x 5 = 30, so 29 divided by 6 is a little less than 5 and will go out to a decimal number. Benchmarks can be one number or multiple numbers.
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Do you mean this symbol ∈ (or backwards 3) if so, it means is an element of; Also, ∉ (with strikethrough) (or backwards 3 with strikethrough) is the symbol for "is not an element of" used in set membership. See also Element (mathematics) and Set (mathematics)
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A matrix in mathematics is a rectangular array of quantities or expressions set out by rows and columns.
Finding the derivative. The derivative is the measure of how a function changes as its input changes.
Natural Log; It's a logarithm with a base of e, a natural constant.