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Comment: Re:Argh science journalism. (Score 1) 155

by ABoerma (#41274613) Attached to: Violation of Heisenberg's Uncertainty Principle

The 'you change the system by measuring it' is called the observer effect, and it has to do with wave function collapse and not with uncertainty.

Regarding the HUP: you can derive that without referring to measurement apparatuses, by just looking at the momentum and position operators. Let position x and momentum p each have standard deviation dx and dp, respectively, then by the Cauchy-Schwarz inequality

        dx dp >= |cov(x,p)|.

The covariance of x and p is

        cov(x,p) = E[(x-E[x])(p-E[p])],

where E[A] is the expected value of operator A, and as the commutator of operators x and p is [x,p]=i hbar,

        dx dp >= |E[(x-E[x])(p-E[p])]| = |E[xp]-E[px]|/2 = hbar/2,

which is the Heisenberg uncertainty principle.

Comment: Re:Price of a textbook. (Score 1) 349

by ABoerma (#37284228) Attached to: Details About Raspberry Pi Foundation's $25 PC

When I was in (Dutch) secondary school, textbooks used to be around €50, so that’s a little cheaper than university but still way over $25. Secondary school students can usually rent their books from the school here instead of having to buy them themselves, so that brings the total cost down to about €10 per book for the student.


+ - Is Wine or Vista more Windows compatible?

Submitted by ZMXJ
ZMXJ (666) writes "We've been hearing quite a few anecdotes & reviews that complain about poor compatibility of old hardware and pre-vista-windows software with Vista; and quite a few articles about improved compatibility of Wine.

My suspicion is that Linux has much better hardware compatibility with Win2K era PCs than Vista does; and my suspicion is that the software compatibility of Wine vs Vista for Win2K apps is about the same. But before I make a recommendation that upgrading to Wine would be better than upgrading to Vista in our company, I wanted to Ask Slashdot to see what other people's experiences with either transition have been like. So far our company has no experience with Vista nor Wine/Linux (quite a bit of Win2K & Linux experience, though). Any experience you guys had moving ot to Vista or to Wine would be of interest.

Would an upgrade from Win2K to Vista or an upgrade from Win2K to Wine/Linux be less painful?"

To err is human -- to blame it on a computer is even more so.