News for hackers. Stuff that matters.

A comment on 0.999...= 1. Parent comment

Re:0.999...= 1 by jonsen on Tuesday April 28, 2020 @12:41PM (#23008778)
The first is an infinite series:

  9/10 + 9/100 + 9/1000 + ... + 9/10^n + ...
The second is not?!
[ Parent | on HN ]
Re:0.999...= 1 by oconnor663 on Tuesday April 28, 2020 @12:57PM (#23008964)
I mean you could if you want to:

1/10 + -9/100 + -9/1000 + -9/10000 + ...

But I just meant them as series, not necessarily as sums.

[ Parent | on HN ]
Re:0.999...= 1 by jonsen on Tuesday April 28, 2020 @01:19PM (#23009297)
Or

  1 - 9/10 - 9/100 - ...
or

  1 - ( 9/10 + 9/100 + ... )
So it becomes circular:

  0.00...1 = 1 - 0.999...
(In math a series is a sum:

https://en.m.wikipedia.org/wiki/Series_(mathematics)

[ Parent | on HN ]
Re:0.999...= 1 by oconnor663 on Tuesday April 28, 2020 @02:31PM (#23010220)
Woops, you're totally right, I think I should've said "sequence".
[ Parent | on HN ]