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Formatting Math as Text (page 3 of 4)

Sections: Common algebra notation, Set and logical notation, Other math notation, Notes on posting

The following table includes geometric, trigonometric, probability, and aditional algebraic notation.

 Type-setformatting Text-onlyformatting Notes sin(x) `sin(x)` Put parentheses around the argument of any function, including sine and cosine. sin2(x) `sin^2(x)` If you're squaring the sine, put the power on the sine. sin(2x) `sin(2x)` Use parentheses to make clear that you mean "sine of 2x", not "the square of the sine of x". ° `degrees°` To indicate "degrees", either write the word out or (on a PC), hold down the "ALT" key and type "0176" to insert the character directly. `theta@` As long as you define yourself, it's okay to use "@" for "theta". Otherwise, spell it out, or pick a Latin letter. `betaß` You can (on a PC) insert a character similar to "beta" by holding down the "ALT" key and typing "0223" on the numeric keypad. Otherwise, spell out the name, or replace "beta" in your exercise with a Latin letter. `pi` Do not use "m" or "n" to stand for "pi", since m and n are variables and pi is a number. Instead, spell out the name. (And please spell it correctly. It's "pi", not "pye" or "pie".) You may find it helpful to use parentheses, as in "sin[(2/3)(pi)]". i `i` When writing complex numbers, just use the "i" as usual. e `e` The natural exponential e is a commonly-known value, just like pi. You don't have define what e is in your post. cis(x) `cos(x) + isin(x)cis(x)` Not everybody is familiar with the "cis" notation. If you use it, define it first, so they know you mean what is shown in the first line. `angle A` You can use the "less than" and "greater than" signs for vectors. `u-dot-vu * v` As long as you define the asterisk to mean the dot product, you can use this for dotting two vectors. Use generous spacing. `u-cross-vu × v` Don't use the letter "X" between the vectors, as this will be confused as being a third vector. Instead, either spell out "cross" or else (on a PC) hold down the "ALT" key and type "0215" on the numeric keypad, using generous spacing so your meaning is clear. AT `A^T` Write the transpose of a matrix using superscript notation. A–1 `A^(-1)` Write the inverse of a matrix using superscript notation. `[[1 2 3] [4 5 6] [7 8 9]]` Matrices are just about impossible to format with text. The bracket design, using outer brackets for the matrix and inner brackets for the rows, has arisen from graphing-calculator notation. Be sure to say what you mean by this, and try to use "CODE" or "PRE" tags or a fixed-width font. `||1 2 3| |4 5 6| |7 8 9||` Determinants are also hard to format with only text. Use bars (the "pipe" character, shown as a broken line on your keyboard, somewhere above the "Enter" key) to delineate the rows. |A| `det(A)|A|` If you use the absolute-value-bar notation for the determinant, state what you mean. ` sum[i=1,n][a_i]sigma[1,n][a_i]` Whatever notation you use for a summation, be sure to define what you mean by restating the first summation in words.

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 Cite this article as: Stapel, Elizabeth. "Formatting Math as Text: Other Math Notation." Purplemath. Available from     http://www.purplemath.com/modules/mathtext3.htm. Accessed [Date] [Month] 2016

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