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Comment Can I try? (Score 1) 90

I'm not a math major, and I have very little experience with any proof. I've never written one. But I would first think this is a 3 part problem. One of n=even, n=odd and n=2^x. Proving all will become 2^x seems to be the goal.

Any even integer n divided by 2 is an integer half the value
Any odd integer n multiplied by 3 is an odd integer.
Any odd integer n plus one is an even integer

Through induction, any power of two in this sequence will end in 1. That is to say if n_0 is 2^x, then the sequence will always be even and always end in 1. 2/2 =1, 8/2/2/2=1.

As an infinite sequence, n will always become odd for any even n_0, not a power of 2.

Since odd n always have 1 added, they will eventually become a power of 2.

Comment Who's fault is it anyway? (Score 1) 209

From my point of view, the photographer knew what he was getting into. It seems the groupon terms are straight forward, they take half, etc. He should have set his maximum coupons to maybe 20 or 30, not 301. He should have been more aware of his costs including time to setup and drive all over. At this point, I'd offer to refund the money to all customer, and cut your losses. Then take an intro to business class at your local community college. Refunding would cost him £4365 if he couldn't get Groupon to chip in any.

Comment some info is too detailed (Score 1) 99

I'm not sure if NextEra is saying it didn't happen, they can't tell, or they are refuting that the screenshots were taken due to a 'hack'. Either way, some of the information looks too credible. For example, NextEra provides output data from wind farms and this data goes into various OASIS systems. One screenshot shows what are presumably OASIS files from as recent as last week. All NextEra would need to do is double check those files, make sure that timestamps and sizes match what exists and that is proof. That should then lead back to the FTP session that gathered that directory listing.

http://en.wikipedia.org/wiki/Open_Access_Same-Time_Information_System

The only thing I know is saying we "found no evidence" one day after the release of information is a stupid PR move. It makes you look incompetent or incapable of detecting / protecting your information, exactly what the 'hacker' was attempting to do. NextEra just reinforced that notion.

Comment Re:The problem (Score 1) 1260

so don't use scalar values. y^(-1) *y = 1
You're basing this on not carrying the 1, but when 0.111... is multiplied by 9, you can't carry the one because the value never ends. Then it must equal 1 based on the limit.

When you say 0.999... you can't assign a value to it, because it never ends. you can multiply 1/9 *9 and write it out in decimal form for years to come, but you'll just keep writing 0.999.... forever. Basically, 0.999.... isn't a real value, but using its limit, it is 1.

Comment Re:Ummmm (Score 1) 1260

No, you're saying .999 = .999... the elipses imply infinite repeating. Since infinity is a direction, not a value, .999... * 10 will be 9.999... there will bo no new 0 at the end of the value, ever.

Comment I thought this was much simpler... (Score 1) 1260

1/9 = 0.111...
9*0.111... = 0.999 = 9* (1/9) = 9/9 = 1
so 0.999... = 1

if you treat it as a limit, it will be one. lim x-> 9 x/9 = 1
\displaystyle\lim_{x\to9}\frac{x}{9} = 1

Which is also the same as the derivative.... d/dx x/9 = 1/9, assuming the point (9,1) => y=(1/9)(x-9)+1 => y=1/9x => f(9) = 1
\frac{d}{dx} \frac{x}{9} = \frac{1}{9}

Comment A UPS won't fix non-redundant power supplies (Score 1) 260

Redundant power supplies are to provide high availability in the case one fails. You can look at a couple things though.

Most UPS vendors have a network-based communication between server and UPS. It may be a premium feature, but it should shutdown a server when the power goes out.

As for power in general, if you need longer times, I would look into some form of generation. APC even makes fuel cell in-datacenter generators. You need a Hydrogen supply and a water drain.

Comment Re:Nettops? (Score 1) 349

Nettops with network boot are a good choice. The reason Thin Clients are more expensive is they usually have an expensive, flash based disk inside. Thin clients also often include a Windows XP embedded or some other tweaked OS. It isn't like 20 years ago when they were just XTERMs.

Also, you are likely paying a tax for the thin client management software that accompanies most thin clients now days. This software allows you to do things like install applications directly to a thin client's flash. Not so thin anymore.

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