Talk:Sequence: Difference between revisions

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imported>Catherine Woodgold
(Simple example?)
imported>Subpagination Bot
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|                  by = --[[User:Aleksander Stos|AlekStos]] 02:57, 10 March 2007 (CST)
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== defined on the natural numbers ==
== defined on the natural numbers ==
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:''"Formally, given any  set ''X'', an infinite sequence is a function (''f'', say) defined on the [[natural numbers]] <math>\{1,2,3,...\}</math>, with values in ''X''. "''
:''"Formally, given any  set ''X'', an infinite sequence is a function (''f'', say) defined on the [[natural numbers]] <math>\{1,2,3,...\}</math>, with values in ''X''. "''
(I'm not sure whether to include zero in the natural numbers.)  --[[User:Catherine Woodgold|Catherine Woodgold]] 08:12, 28 April 2007 (CDT)
(I'm not sure whether to include zero in the natural numbers.)  --[[User:Catherine Woodgold|Catherine Woodgold]] 08:12, 28 April 2007 (CDT)
::Done.  --[[User:Catherine Woodgold|Catherine Woodgold]] 10:14, 29 April 2007 (CDT)


== Simple example? ==
== Simple example? ==
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:<math>1 + i, 2 + 3i, 3 + 5i</math>
:<math>1 + i, 2 + 3i, 3 + 5i</math>
--[[User:Catherine Woodgold|Catherine Woodgold]] 08:20, 28 April 2007 (CDT)
--[[User:Catherine Woodgold|Catherine Woodgold]] 08:20, 28 April 2007 (CDT)
::I wouldn't object any proposed changes, the formal definition above included (well I thought a while about this definition and I think there would be no harm if the term "subset" gets deleted). As for 0 in naturals, nothing is "globally" decided, so probably both solutions are possible (I'd start with 1).--[[User:Aleksander Stos|AlekStos]] 11:55, 28 April 2007 (CDT)
:::Done.  Thank you.  --[[User:Catherine Woodgold|Catherine Woodgold]] 10:15, 29 April 2007 (CDT)

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defined on the natural numbers

I would like to change this:

"Formally, given any set X, an infinite sequence is a function (f, say) defined on a subset of natural numbers with values in X. "

to this:

"Formally, given any set X, an infinite sequence is a function (f, say) defined on the natural numbers , with values in X. "

(I'm not sure whether to include zero in the natural numbers.) --Catherine Woodgold 08:12, 28 April 2007 (CDT)

Done. --Catherine Woodgold 10:14, 29 April 2007 (CDT)

Simple example?

This is given as a "simple example" of a sequence of complex numbers:

How about a simpler example, where it's easy to predict the next term? e.g.

--Catherine Woodgold 08:20, 28 April 2007 (CDT)

I wouldn't object any proposed changes, the formal definition above included (well I thought a while about this definition and I think there would be no harm if the term "subset" gets deleted). As for 0 in naturals, nothing is "globally" decided, so probably both solutions are possible (I'd start with 1).--AlekStos 11:55, 28 April 2007 (CDT)
Done. Thank you. --Catherine Woodgold 10:15, 29 April 2007 (CDT)