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Anyone know what I'm talking about?

- Thread starter jldibble
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- #1

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Anyone know what I'm talking about?

- #2

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Do you mean that, when taking a partial derivative and want to specifically keep t constant, you can write, for example, ##\left(\frac{\partial f}{\partial x}\right)_t##?

Anyone know what I'm talking about?

- #3

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No, I mean something much simpler. It's a symbol or notation that you'd use as you're explaining how variables will change relative to each other.Do you mean that, when taking a partial derivative and want to specifically keep t constant, you can write, for example, ##\left(\frac{\partial f}{\partial x}\right)_t##?

Here's a very simple example using the equation d=vt (distance = speed*time):

Say I want to hold the speed at a constant value; I now know that by increasing the amount of time, I'll increase the value of the distance by a proportionate amount. My question involves a short-hand symbol for indicating that the speed is the variable that's being held constant, instead of wasting time writing out "___ is constant" everytime I'm discussing an equation.

- #4

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Do you mean just saying:

##D= \frac{v}{t} \rightarrow D= \frac{v_1}{t}##? Because that sort of does it.

- #5

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Do you mean just saying:

##D= \frac{v}{t} \rightarrow D= \frac{v_1}{t}##? Because that sort of does it.

That's more like it, but not exactly what I had in mind.

It's such a dumb little thing but it's driving me nuts.

Thanks for the reply

- #6

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What class was it? That might help?That's more like it, but not exactly what I had in mind.

It's such a dumb little thing but it's driving me nuts.

Thanks for the reply

- #7

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http://books.google.ca/books?id=QIk...=onepage&q=constant variance notation&f=false

- #8

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It's not for a specific class. I tutor for math and physics and there are times when I want to denote which variable in the equation is being held constant for the sake of discussing how the other variables effect each other.What class was it? That might help?

I remember a math (or science) teacher I had in high school making a mark near the variable that would be held constant.

- #9

Mute

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I'm not familiar with any standard notation that denotes what you want. You could make one up for the students you are tutoring, but let them know it's not a notation they're likely to see elsewhere.It's not for a specific class. I tutor for math and physics and there are times when I want to denote which variable in the equation is being held constant for the sake of discussing how the other variables effect each other.

I remember a math (or science) teacher I had in high school making a mark near the variable that would be held constant.

You could say something like "let d = x(t) = vt", where the function notation x(t) explicitly denotes that t is the variable. If the students need a mark to remind them which symbols are constants, function notation may at first be confusing for them, but it's a notation they will likely see again in the future.

- #10

jbriggs444

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If you are talking about the distinction between "dependent variables" and "independent variables", I am not familiar with any specific notation, but there is a common convention of formulating equations so that the dependent variable goes on the left and the independent variable or variables go on the right.

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