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Math Help - inverted 6 symbol

  1. #1
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    inverted 6 symbol

    can anyone enlighten me as to what the inverted 6 symbol means? its the number 6 inverted left to right. i came across it in my calculus notes under partial derivatives under functions of two variables.

    the formula goes

    fx = (inverted 6)f/(inverted6)x = (inverted 6)z/(inverted 6)x
    fy = (inverted 6)f/(inverted6)y = (inverted 6)z/(inverted 6)y

    they are defined by the limits:
    (inverted 6)f/(inverted 6)x = lim (as h approaches 0) [f(x+hy)-f(xy)] /h
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  2. #2
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    The formula is meant to answer your question! It's a definition just explaining the meaning of the notation, which makes the left and right sides just alternative notations - just as dy/dx and y' are alternatives. \partial is just d for partial differentiation, in which all variables not selected by this symbol are held as constants during differentiation - and notice the latex code is \partial
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  3. #3
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    Quote Originally Posted by tom@ballooncalculus View Post
    The formula is meant to answer your question! It's a definition just explaining the meaning of the notation, which makes the left and right sides just alternative notations - just as dy/dx and y' are alternatives. \partial is just d for partial differentiation - and notice the latex code is /partial
    oh okay... sorry for my dumb question... never really paid attention in lectures so thought it was a symbol for something... thanks for explaining...
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  4. #4
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    The 'dumb' questions are often the ones that need asking!
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  5. #5
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    I once had a class of Junior and Senior math majors whose Advanced Calculus text book included the sentence:
    "In this case we say that y is proportional to x: in symbols, y  \alpha  x."

    Every one wanted to know what that symbol, \alpha meant!
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