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Pickett
Pickett
5:22 AM
@MikeHoneychurch With a site license you first got an email saying that 10.2 would soon be available, and then fifteen days later came the email with the actual activation key. As I recall from what was said here, with a home license it was possible to buy the new version before WRI sent out an email about it.
 
Sjoerd C. de Vries
Sjoerd C. de Vries
@MikeHoneychurch I got one.
 
 
4 hours later…
Patrick Stevens
Patrick Stevens
9:15 AM
@MikeHoneychurch same, I got a site-licence email
 
 
3 hours later…
kirma
kirma
12:04 PM
@Pickett Yes, home license (upgrade, at least) was possible immediately after public announcement of 10.2. It required knowing what page to look at, though.
 
 
9 hours later…
user1667423
user1667423
9:12 PM
Why is Mathematica not solving the following system of differential equations?
DSolve[{
x''[t] == -2 Cos[y[t]]/Sin[y[t]] x'[t] y'[t],
y''[t] == Sin[y[t]] Cos[y[t]] x'[t] x'[t]
}, {x[t], y[t]}, t]
 
 
1 hour later…
Patrick Stevens
Patrick Stevens
10:18 PM
What makes you think a closed form exists? NDSolve can do it, though. Some really rather pretty diagrams.
 
LLlAMnYP
LLlAMnYP
10:34 PM
Perhaps any of you gents know what this kind of construct is called and what's it good for?
happyQ[1] = True;
e : happyQ[i_] := e = happyQ[e = False; #.# &@IntegerDigits[i]]
I'm referring to this default value for `e` being the function itself.
 

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