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October 21st, 2011, 06:07 AM   #21
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Re: reverse n

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Originally Posted by vdrn
Thanks! Do you know the source of this formula?
I'm sure he just made it up on the spot, it's the obvious one.
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October 21st, 2011, 06:33 AM   #22
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Re: reverse n

So is there a way to do this just by plugging in n (without using a_k)?
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October 21st, 2011, 06:54 AM   #23
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Re: reverse n

Quote:
Originally Posted by vdrn
So is there a way to do this just by plugging in n (without using a_k)?
Depends on what you mean by a "way". You could define something like

(something like that; the exponents aren't quite right I think) and then what you want is But this amounts to the same thing.
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October 21st, 2011, 09:30 AM   #24
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Re: reverse n

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Originally Posted by CRGreathouse
Quote:
Originally Posted by vdrn
So is there a way to do this just by plugging in n (without using a_k)?
Depends on what you mean by a "way". You could define something like

(something like that; the exponents aren't quite right I think) and then what you want is But this amounts to the same thing.
can't you do something like
?
I haven't checked it, but you should get the idea.
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October 21st, 2011, 12:59 PM   #25
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Re: reverse n

Sure, or dozens of other equivalent things.
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October 21st, 2011, 03:03 PM   #26
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Re: reverse n

Quote:
Originally Posted by CRGreathouse
f(n) is the reverse of the decimal digits of n. What more do you want?
Quote:
Originally Posted by vdrn
generalized expression of what comes after f(n)=
Quote:
Originally Posted by CRGreathouse
Quote:
Originally Posted by vdrn
generalized expression of what comes after f(n)=
Isn't that what I just wrote? If not, explain what you mean by "generalized" and "expression".
So now do you understand what I mean? Maybe there is some language barrier, since english is not my p.language(obviously). Anyway, no need for equivalent version, but a shorter way of writing would be nice (just having to input n to get reversed n).
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October 21st, 2011, 07:16 PM   #27
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Re: reverse n

Quote:
Originally Posted by vdrn
So now do you understand what I mean?
No.

Quote:
Originally Posted by vdrn
Maybe there is some language barrier, since english is not my p.language(obviously).
I don't think so. I think the problem is that you're using terms that don't have precise mathematical descriptions.
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October 22nd, 2011, 03:31 AM   #28
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Re: reverse n

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Originally Posted by CRGreathouse
Quote:
Originally Posted by vdrn
So now do you understand what I mean?
No.

Quote:
Originally Posted by vdrn
Maybe there is some language barrier, since english is not my p.language(obviously).
I don't think so. I think the problem is that you're using terms that don't have precise mathematical descriptions.
That's right. Ok, thanks for your time.
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October 22nd, 2011, 04:07 PM   #29
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Re: reverse n

No problem. Anything else I can do?
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