What is this called? It's almost the opposite of exponent and what symbol do we use when typing it? For example, exponent's we use the up arrow key: x^y

Question

What is this called? It's almost the opposite of exponent and what symbol do we use when typing it?  For example, exponent's we use the up arrow key: x^y

anonymous · Answer

like log?

timaashorty · Answer

$$\huge x_{b}$$

or

$$\huge x_{3}$$

johnweldon1993 · Answer

Subscript? base?

Like log base 3 would be $\large \log_{3}$

timaashorty · Answer

oops i meant:

$$\huge x_{0}$$

timaashorty · Answer

is that the same thing as log base?

anonymous · Answer

base is the 0 that u wrote

anonymous · Answer

$$
x^{superscript}_{subscript}
$$

johnweldon1993 · Answer

No that is like (in a physics perspective) like initial

Like $\large v_0$ would mean initial velocity

but the 0 is written as the subscript

timaashorty · Answer

So it's called a subscript?

timaashorty · Answer

and I'm referring to it as being in a question like this:

Find the three iterates of 
$$f(x)= 3x-7 $$
IF $$x_{0} = -8$$

anonymous · Answer

For a sequence, the subscript denotes the index.

johnweldon1993 · Answer

Ahh yes then this refers to what i said above about the initial thing

This means you use the fact that the first x = -8

So you would do

f(x_0) = 3(-8) - 7

Find out what that results to...then use that output, and your next input, also known as x_1

timaashorty · Answer

Now I see. Thank you so much all you three ! :)

johnweldon1993 · Answer

Of course :)