![]() ![]() The notation is "LN" (ell-enn, but in lower-case), not "IN" (eye-enn). Use the underscore to indicate the base, and use parentheses to make clear what is inside the log.ĭo not use a capital " I" for the natural log. Define what you mean (" x-sub-one") in your post, especially if you're using x2, because the 2 could be mistaken for an exponent. ![]() The underscore is handy, but if you're dealing with very complicated expressions, you might want to use the bracketing notation. Many people just put the subscript after the variable, but this can be confused with superscripting. Subscripting doesn't come up much, and it's a pain when it does. You can use "+/–", or you can enter the character directly (on a PC) by holding down the "ALT" key and typing "0177" on the numeric keypad. Whichever you use, define in your post what you mean by the notation. The "less than, greater than" sign is also sometimes used, but not so commonly. But the "equals-slash-equals" sequence more closely simulates the "not equal to" symbol. The exclamation mark is commonly used in computer programming to mean "not", so "!=" means "not equal". Write out "greater than or equal to" just as you say it: a "greater than" sign followed by an "equals" sign. In this case, you would say "I'm using '5th-rt( z)' to stand for 'the fifth root of z'." If you type cbrt7x, it will be assumed that the x is inside the radical, too.įor larger-index roots, give the value of the index, and explain your notation. The abbreviation "cbrt" stands for "the cube root of", and the parentheses make it clear that the " 7" is inside the radical, but the " x" is not. The abbreviation "sqrt" stands for "the square root of", and the parentheses make it clear that both the " 2" and the " y" belong inside the radical. The "ceiling" function is a named function. Type out its name, and put its argument inside parentheses, following the patter of function notation. ![]() The "floor" function is a named function. You might even just type out the cases as " f ( x) is equal to 3 x for x less than or equal to zero, and is equal to x 2 + 1 for x greater than zero." ![]() Just do the best you can, and preface whatever you post by telling the reader that what follows is meant to indicate a piecewise function. Piecewise functions are one of the few items for which multi-line formatting is pretty-much inescapable. Yes, this is clunky notation, but the tutors will understand that you mean " f-inverse of x."Įither use a lower-case letter O to indicate function composition, spacing things out so it doesn't look like you're trying to spell "fog", or else switch from " f-compose- g of x" notation to " f of g of x" notation. Otherwise, the viewer may wonder if x^2y^3z^4 might mean something like x 2 y 3 z 4. Use spacing to make clear where one factor (and its exponent) ends and the next begins. Without the parentheses, it will look like you mean "two cubed, times x", or 2 3 x, when you actually mean the variable to be in the exponent. Without the parentheses, it will look like you mean " x squared, divided by three", or (x^2)/3. If you have a graphing calculator, this is the same character as your calculator uses for powers. The carat key, usually "shift-6" on the keyboard, is customarily used to indicate exponents. Use different grouping symbols to demark the two fractions within the complex fraction. Without the parentheses, it would not be clear that the first " x" belongs inside the numerator, or that the " 5 x + 6" belongs inside the denominator. The parentheses make it clear that the "five" is included in the denominator. The variable isn't often in the denominator like this, so use parentheses to make it clear where the variable belongs. Some will assume that you meant 1/(2x)+5 or even 1/(2x+5) Without the parentheses around the "one-half", it will be unclear whether or not the variable is meant to be included in the denominator. The asterisk is commonly used to indicate multiplication, but you can insert the "times" sign (on a PC) by holding down the "ALT" key and typing "0215" on the numeric keypad. The "slash" is commonly used to indicate division or fractions, but you can also insert the "divided by" sign (on a PC) by holding down the "ALT" key and typing "0247" on the numeric keypad. ![]()
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