Search found 5 matches

by xkcdaddict
Sat Feb 14, 2009 5:20 pm UTC
Forum: Mathematics
Topic: I sock at maths
Replies: 6
Views: 976

Re: I sock at maths

Sorry, I misread the question as "guaranteed to have exactly 2 pairs."
English + late night != good

I agree with Token btw.
by xkcdaddict
Sat Feb 14, 2009 3:26 pm UTC
Forum: Mathematics
Topic: Math Software
Replies: 143
Views: 167759

Re: Math Software

I was recently introduced to winplot.

It's a great small tool for windows, can do 2D and 3D and has an internal list of all the functions.
by xkcdaddict
Sat Feb 14, 2009 3:24 pm UTC
Forum: Mathematics
Topic: I sock at maths
Replies: 6
Views: 976

Re: I sock at maths

For those who want the simple
Spoiler:
100%

You have 14 socks

You take out 9.

By pigeon hole theory you've got 2 extras, which means you can make 2 pairs of socks.


edit: this is the ONLY time I haven't complicated a question
by xkcdaddict
Sat Feb 14, 2009 3:20 pm UTC
Forum: Mathematics
Topic: 1 + 1 = ?
Replies: 44
Views: 5852

Re: 1 + 1 = ?

(x-x)(x+x) = x²-x²
(x-x)(x+x) = x*(x-x)
x+x = x
2x = x
2 = 1
1+1 = 1, 2, 3, or 4.

1+1 is clearly ambiguous.

:D

spot the error haha

another one:

(-1) * (-1)= 1

log (-1 * -1) = log 1
log -1 + log -1 = log 1 = 0
log -1 = - (log -1)
(log -1)/(log -1) = -1
1 = -1

1+1 = 0, +-2

:D
by xkcdaddict
Sat Feb 14, 2009 3:08 pm UTC
Forum: Mathematics
Topic: 0/0=?
Replies: 24
Views: 2238

Re: 0/0=?

Complex numbers describe nearly anything electrical engineering aspect all the way to bird flight.
Just because they're imaginary doesn't mean they don't occur in nature.

As for 0/0, it's annoying.

lim x/x = 1
x->0

0^0 = 1 (according to my calculator :P)

and power laws dictate x^0 = x/x.

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