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/sci/ - Science & Math

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4555829 No.4555829 [Reply] [Original]

Hi /sci/. I was never a math wiz, but I'm reading a book on cryptography and they keep using these things that look like exponents on the bottom right of the variable. What the hell are they?

>> No.4555837

Bump for needing a quick answer so I can finish up this chapter.

>> No.4555838

subscripts

>> No.4555840

Those are called subscripts. They're used to label variables (often the components of a vector, components of a matrix, etc.). What exactly they refer to depends on the context.

>> No.4555843

They're call inponents. <span class="math">X^{Y}[/spoiler] means take X and multiply it with itself Y times. <span class="math">X_{Y}[/spoiler] means take X and divide it with itself Y times.

>> No.4555844
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4555844

you're gonna have a hard time if you haven't seen that much math bro
its like an index. think of it like how it is in a for loop.

>> No.4555846

>>4555844
I wouldn't want to have a for loop iterating over an infinite set.

>> No.4555847
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4555847

>>4555843

>> No.4555865

>>4555844
I'm 16 years old and I enjoy programming. Unfortunately the town I live in lacks a decent curriculum in math and science since no one here seems to have any idea of a future. I get by on what I know and what I don't know I will strive to learn until I am up to par.

Also thanks for your help /sci/ you truly are a master race, not for your intelligence but for so humbly helping me in my time of need.

>> No.4555869

>>4555843
Also, that's an obvious troll.

>> No.4557766

What book on crypto are you reading, OP?
I'm interested in the subject as well.

>> No.4557784
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4557784

>>4555843

>> No.4557789
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4557789

>>4555840
what does it mean in this case?

>> No.4557790

>>4555829
FUCK, your image pisses me off, OP.
When you use alpha blending to anti-alias something, ESPECIALLY text, you DO NOT FUCKING ALSO FADE THE COLOR TO WHITE or whatever the background color is. FUCK. Did we time travel back to 1997 or some shit?

>> No.4557799
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4557799

>>4557790
>>4557789

>> No.4557807

>>4557799
don't use black background bro!

>> No.4557808

>>4555843
Well shit, I think that's what it should mean.

>> No.4557817

>>4557807
If you alpha blend correctly, it doesn't matter what color your background is, except that black on black probably isn't going to show up very well.

>> No.4557827

>>4557789
you are in cicle 'n'
the result 'X' of the next 'cicle' (n+1) is...

>> No.4557846

>>4557789
Think of X_n as a list of variables. X represents the whole list, and X_n represents the item at position "n".
To calculate the value of the item at position "n+1", you apply this recursive formula to the value of position "n."

>> No.4557886

>>4557846
I understand now, thanks.