The infamous .9 repeating = 1 thread

[Howard]

Originally posted by: smack Down

Originally posted by: Howard

Originally posted by: smack Down

Originally posted by: Howard

Originally posted by: smack Down

Originally posted by: Amplifier
.9999 repeating doesn't equal 1 because what about that .000...01 that would be left over don't try to argue with me i have a phd in math

Easy the .000....1 equals zero.

I can't believe any of you are falling for Amp's cheap trix.

Well than what number does .000....1 equal?

It's not a tumor. I mean number.

Seriously, 0.0...1 isn't a number.

.999.... isn't a number either.

Why not?

 

[Special K]

Numerous mathematical proofs were given in the previous thread as to why 0.9999... = 1. Personally I don't see how anyone can argue with the infinite summation one:

summation(x, 9/(10^x), 1, inf) = 0.9 + 0.09 + 0.009 + 0.0009 + ...

Work out the summation and it equals 1. I just don't see how anyone can argue against that.

 

[Cooler]

This thread will end up 50 pages like last one we need a lock !

 

[sao123]

Originally posted by: Acanthus
ATs search function fails me again. Does anyone have a link?

I cant find it... but it went something like this...

.99999 = 1

no it doesnt...
yes it does...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
you mom is fat & ugly...
yes it does...
no it doesnt...
why dont you learn some junior high algebra...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
I dont know anything about math, but I did stay in a holiday inn express last night...
yes it does...
guys... grow up. this is the most reposted subject on AT... and your wrong. It doesnt.
yes it does...
no it doesnt...
yes it does... the bible said it so it must be true.
666 diediedie religious freaks... the bible is all lies...I'm aethiest and NO IT DOESNT.
ANANDTECH MODERATOR: This thread is locked... and BTW... YES IT DOES.

and that my friends is the PTI version of ATOT.

 

[91TTZ]

Originally posted by: Special K
Numerous mathematical proofs were given in the previous thread as to why 0.9999... = 1. Personally I don't see how anyone can argue with the infinite summation one:

summation(x, 9/(10^x), 1, inf) = 0.9 + 0.09 + 0.009 + 0.0009 + ...

Work out the summation and it equals 1. I just don't see how anyone can argue against that.

In math, you're right, but if you had philosophy class the teacher would argue with you to no end, saying that if .9999 = 1, then why don't they just call it 1? He'd say the fact that it has a different value tells you that it's a different number.

 

[bleeb]

Thanks to Kyteland for starting that thread. I had a little fun egging it on =)

 

[Special K]

Originally posted by: 91TTZ

Originally posted by: Special K
Numerous mathematical proofs were given in the previous thread as to why 0.9999... = 1. Personally I don't see how anyone can argue with the infinite summation one:

summation(x, 9/(10^x), 1, inf) = 0.9 + 0.09 + 0.009 + 0.0009 + ...

Work out the summation and it equals 1. I just don't see how anyone can argue against that.

In math, you're right, but if you had philosophy class the teacher would argue with you to no end, saying that if .9999 = 1, then why don't they just call it 1? He'd say the fact that it has a different value tells you that it's a different number.

I guess I could see that, however I was arguing from a mathematical standpoint, not a philosophical one.

Maybe if we had titled the original thread "In mathematics, 0.999.... = 1", then there would have been fewer disagreements.

 

[xtknight]

http://mathforum.org/dr.math/faq/faq.0.9999.html

3(1/3) = 3(.3333...) = .9999... = 1

nuff said

 

[jagec]

Originally posted by: 91TTZ

Originally posted by: Special K
Numerous mathematical proofs were given in the previous thread as to why 0.9999... = 1. Personally I don't see how anyone can argue with the infinite summation one:

summation(x, 9/(10^x), 1, inf) = 0.9 + 0.09 + 0.009 + 0.0009 + ...

Work out the summation and it equals 1. I just don't see how anyone can argue against that.

In math, you're right, but if you had philosophy class the teacher would argue with you to no end, saying that if .9999 = 1, then why don't they just call it 1? He'd say the fact that it has a different value tells you that it's a different number.

So is aluminum mined in a US a different element than aluminium mined in GB?

 

[Evadman]

Originally posted by: sao123
it went something like this...

.99999 = 1

no it doesnt...
yes it does...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
you mom is fat & ugly...
yes it does...
no it doesnt...
why dont you learn some junior high algebra...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
no it doesnt...
yes it does...
I dont know anything about math, but I did stay in a holiday inn express last night...
yes it does...
guys... grow up. this is the most reposted subject on AT... and your wrong. It doesnt.
yes it does...
no it doesnt...
yes it does... the bible said it so it must be true.
666 diediedie religious freaks... the bible is all lies...I'm aethiest and NO IT DOESNT.
ANANDTECH MODERATOR: This thread is locked... and BTW... YES IT DOES.

and that my friends is the PTI version of ATOT.

Excelent summary.

 

[91TTZ]

Originally posted by: jagec

So is aluminum mined in a US a different element than aluminium mined in GB?

Yes, it's slightly lighter due to it having less letters in the name.

 

[DrPizza]

Originally posted by: ruffilb
You are all noobs! It is clear that .999 repeating = 0!

That's been my signature for 2 years now. 😛 🙂
Only once has someone pointed out that they noticed it.

 

[DrPizza]

Originally posted by: 91TTZ

Originally posted by: Special K
Numerous mathematical proofs were given in the previous thread as to why 0.9999... = 1. Personally I don't see how anyone can argue with the infinite summation one:

summation(x, 9/(10^x), 1, inf) = 0.9 + 0.09 + 0.009 + 0.0009 + ...

Work out the summation and it equals 1. I just don't see how anyone can argue against that.

In math, you're right, but if you had philosophy class the teacher would argue with you to no end, saying that if .9999 = 1, then why don't they just call it 1? He'd say the fact that it has a different value tells you that it's a different number.

I'd simply point out to the philosophy professor that ".5 is the same as 1/2, is it not? Many things in our everyday experience have multiple names. For the mathematician, .999repeating and 1 are interchangeable. But the average person refers to it as 1. Sometimes, the so-called experts in a field have one name and normal people have two names for it. You, for instance, would call this course 'philosophy', but the average person has no preference for that term over the phrase 'a bunch of bullsh!t'"
🙂 😛 I failed philosophy for stating something quite similar in substance. Hint: never disagree with the prof in courses where you just b.s. on papers.