View Full Version : Maths
What's wrong with this (http://www.futilitycloset.com/2006/10/27/bullseye/)logic?
Jester666
25-10-07, 01:11 PM
I hate Maths!!!! Its just too clever for it's own good!
Makes sense to me ? :smt045
Dan
Spiderman
25-10-07, 01:19 PM
just looks like an attempt to justify why all our bills are now rounded up or down based on a 3 decimal point system.
i'm sorry but i spend my pennies in 2 decimalplaces so why are my bills calculated to 3?????
Anyone?
kwak zzr
25-10-07, 01:22 PM
to charge you more without you knowing about it.
Spanner Man
25-10-07, 01:23 PM
Afternoon all.
If a = 0.999999 then 9a= 8.999991 which divided by 9 makes a .999999.
Decimal places my dear:D
Cheers.
I wonder how many are grabbing a calculator after reading this:D
Cheers.
Supervox
25-10-07, 01:24 PM
It's NOT logic at all - just incorrect maths !!
a = 0.999 is correct
10a = 9.999 is incorrect
10a = 9.99
Therefore 10a - a 9.999 - 0.999 is incorrect it should read 9.99 - 0.999
which then gives the correct answer 8.991
Simple really :cool:
Filipe M.
25-10-07, 01:25 PM
Super, you missed the "..." after the 999 ;)
Afternoon all.
If a = 0.999999 then 9a= 8.999991 which divided by 9 makes a .999999.
Decimal places my dear:D
Cheers.
I wonder how many are grabbing a calculator after reading this:D
Cheers.
A calculator? No.
My poor aching brain on the other hand...
Mike2165
25-10-07, 01:27 PM
WWWWAAAAAYYYYYYY over my head that one!!
It's NOT logic at all - just incorrect maths !!
a = 0.999 is correct
10a = 9.999 is incorrect
10a = 9.99
Therefore 10a - a 9.999 - 0.999 is incorrect it should read 9.99 - 0.999
which then gives the correct answer 8.991
Simple really :cool:
You missed the crucial ... which means literally "and so on" and is used to show a repeating pattern, in this case 0.999999999999999999999999999999999 (recuring to infinity)
Work is out again with this crucial difference and the linked page is quite correct
Spanner Man
25-10-07, 01:30 PM
A calculator? No.
My poor aching brain on the other hand...
Mine was aching too, so I cheated & grabbed my calculator!:D
Cheers.
You missed the crucial ... which means literally "and so on" and is used to show a repeating pattern, in this case 0.999999999999999999999999999999999 (recuring to infinity)
Work is out again with this crucial difference and the linked page is quite correct
Exactly! Which is why Spannerman's explanation doesn't add up either.
Supervox
25-10-07, 01:35 PM
My maths is only incorrect if you accept the concept of infinity.
Personally I don't - to everything there must be an end.
Moving on - if there is an end, then 10a - a will always result in 8 followed by a finite number of 9's and the final number will be a 1
You can't do maths without infinity.
you cant do complex maths with out infinity, everyday stuff you can!
My maths is only incorrect if you accept the concept of infinity.
Personally I don't - to everything there must be an end.
That's a shame, how do you show 1/3 in decimal form then? ;)
im having hotdogs for tea
you cant do complex maths with out infinity, everyday stuff you can!
Even not terribly complex maths needs infinity, but I get your point. I was meaning proper maths not just adding up and taking away.
I like this other proof that 0.999...... = 1
1/3 = 0.333...
3 x 1/3 = 1
3 x 0.333... = 0.999...
therefore 0.999... = 1
:D
I love maths :D
I like this other proof that 0.999...... = 1
1/3 = 0.333...
3 x 1/3 = 1
3 x 0.333... = 0.999...
therefore 0.999... = 1
:D
I love maths :D
:cool:
Spanner Man
25-10-07, 01:48 PM
You can't do maths without infinity.
I can & do, I always round UP customers bills to the nearest £100....Works for me!:D
Cheers.
Thanks for finding that site Sarah, I love things like that, I particularly like this example of wrong maths
http://farm2.static.flickr.com/1171/1472210965_a57117cbbe_m.jpg
Thanks for finding that site Sarah, I love things like that, I particularly like this example of wrong maths
http://farm2.static.flickr.com/1171/1472210965_a57117cbbe_m.jpg
Glad you like it. That's a really good one!!
Luckypants
25-10-07, 01:51 PM
Even not terribly complex maths needs infinity, but I get your point. I was meaning proper maths not just adding up and taking away.
'Adding up and taking away' is proper maths for most of us. We deal in real things not some airy fairy theoretical maths to prove the existance of something or other.
Whole numbers rule!:smt077
'Adding up and taking away' is proper maths for most of us. We deal in real things not some airy fairy theoretical maths to prove the existance of something or other.
Whole numbers rule!:smt077
Whatever :rolleyes:
Pedro68
25-10-07, 01:54 PM
That's quite correct ... 0.999... (which means the 9 recurs to inifinity) is as close to 1 as possible that if you use finite maths they are equal.
Well that's my take on it :rolleyes:
Really wanna head-hurting moment?
Read this then (http://en.wikipedia.org/wiki/0.999...)
Maths is fun :D
Supervox
25-10-07, 01:55 PM
"Infinity is an abstract concept designed to appease those without the determination or ability to discover the finite limit"
Not entirely relevant, but made me giggle:
Q: Why did the computer scientist die in the shower?
A: Because he read the instructions on the shampoo bottle: Lather, Rinse, Repeat.
Mike2165
25-10-07, 01:56 PM
im having hotdogs for tea
I'm having a finite number of meatballs for mine:smt045
"Infinity is an abstract concept designed to appease those without the determination or ability to discover the finite limit"
Ohh quotes!
"The only way to comprehend what mathematicians mean by Infinity is to contemplate the extent of human stupidity." Voltaire
Or, and I believe this one will finish the discussion:
"To infinity, and beyond!" Buzz Lightyear
Pedro68
25-10-07, 01:59 PM
Not entirely relevant, but made me giggle:
Q: Why did the computer scientist die in the shower?
A: Because he read the instructions on the shampoo bottle: Lather, Rinse, Repeat.
Haha ... a classic example of a self-recursive algorithm :geek:
Man then went on to prove that black was white and got killed on the next zebra crossing...
Douglas Adams
Pedro68
25-10-07, 02:04 PM
I'm having a finite number of meatballs for mine:smt045
I'm having one of those microwave meals for 0.999... :p
stevehaskew
25-10-07, 02:06 PM
I'd quote Douglas Adams about why the population of the universe is zero, but I don't think my boss would appreciate me doing it now.
I'm having one of those microwave meals for 0.999... :p
Genuine lol.
I love this thread.
Spanner Man
25-10-07, 02:12 PM
.
I love this thread.
Don't you find that your anorak flutters in the breeze when you're on your bike?:D
Don't you find that your anorak flutters in the breeze when you're on your bike?:D
Oooh, bitchy!!
If I have 3 cakes, I eat one and the other one is given to my mate Scott...
How annoyed am I!
Genuine lol.
I love this thread.
This thread is soooo boring! Soon you all be talking about imaginary numbers. :geek:
Yes, all this stuff is over my head as I did really badly in my A-level Maths. Mainly cos I was concentrating on fun stuff. :p
seedy100
25-10-07, 02:21 PM
I
Spanner Man
25-10-07, 02:29 PM
Oooh, bitchy!!
I think you'll find that 79.26% of the time I'm indulging in gentle sarcasm for humours sake. Except for the 36.257% of the year when I'm being serious.
The year being the sum of the whole of my working hours, as I have better things to do in the evening (like drinking meths).
As I have a mean average working day of 12.243 hours weekdays, & 8.659 hours on Saturdays, of which 7.432% of the time I'm drinking coffee. I would like you 'O' Little miss Boffinofbritain to explain mathematically how you worked out that I was A, being bitchy,
& B, assuming my mug contains 16 fluid ounces of coffee & takes me 9.49785 minutes to drink. How many spoons of coffee I consume in a minute, at 2.975 spoons per mug.:D
I think you'll find that 79.26% of the time I'm indulging in gentle sarcasm for humours sake. Except for the 36.257% of the year when I'm being serious.
The year being the sum of the whole of my working hours, as I have better things to do in the evening (like drinking meths).
As I have a mean average working day of 12.243 hours weekdays, & 8.659 hours on Saturdays, of which 7.432% of the time I'm drinking coffee. I would like you 'O' Little miss Boffinofbritain to explain mathematically how you worked out that I was A, being bitchy,
& B, assuming my mug contains 16 fluid ounces of coffee & takes me 9.49785 minutes to drink. How many spoons of coffee I consume in a minute, at 2.975 spoons per mug.:D
I missed off a smiley again didn't I.:rolleyes:
Spanner Man
25-10-07, 03:14 PM
I missed off a smiley again didn't I.:rolleyes:
I knew that! I'm just pi%%ing about!:D:D
I
j, much more practical if you want to keep the electricity flowing!
Regarding concepts of the infinite, I remember my school maths teacher hammering it into us that infinity didn't exist, things could only "tend towards infinity". Shame I've forgotten most of the maths he also taught us.
yorkie_chris
25-10-07, 09:42 PM
Considering that an overdamped, single degree of freedom system will tend exponentially toward its equilibrium position, reaching it only as time reaches infinity. From a design perspective it is usually said that the system is at rest when time is at 4 time constants, derived from the roots of the systems characteristic equation, at this time the displacement of the system will be at 2% of its initial displacement.
Or, in simpler form ... CLOSE ENOUGH :p
Isn't that much easier to swallow?
Pedro68
26-10-07, 08:33 AM
Considering that an overdamped, single degree of freedom system will tend exponentially toward its equilibrium position, reaching it only as time reaches infinity. From a design perspective it is usually said that the system is at rest when time is at 4 time constants, derived from the roots of the systems characteristic equation, at this time the displacement of the system will be at 2% of its initial displacement.
Or, in simpler form ... CLOSE ENOUGH :p
Isn't that much easier to swallow?
No :rolleyes:
Or am i just having a Blackadder "Mr Thickie" moment?!
"as time reaches infinity"?
how do we know it's reaching infinity? Infinity is infinite. It also doesn't exist, so how do we know that ANYTHING is reaching it :confused:
"derived from the roots of the systems characteristic equation"?
which is what exactly?! what is the systems characteristic equation that we need to take the root of? :confused:
however, it is now friday and therefore approaching beer time, which sadly is a finite time that shall end at some point before the evil root of 900 (measured in hours of the day that is known as monday).
unless of course, like me, you're off next week :D
I can & do, I always round UP customers bills to the nearest £100....Works for me!:D
Cheers.
:lol: I know you say this in jest. But I am quite sure the local bike shop do this as standard practise. That and add a zero to the prices of their second hand machines.
Spanner Man
26-10-07, 09:06 AM
:lol: I know you say this in jest. But I am quite sure the local bike shop do this as standard practise. That and add a zero to the prices of their second hand machines.
Sadly most do old Chap! That, & move the decimal point one place to the right on days ending with a y:D
Cheers.
yorkie_chris
26-10-07, 11:42 AM
which is what exactly?! what is the systems characteristic equation that we need to take the root of? :confused:
Was revising vibration systems as I had a test on it today, and just felt like talking complete b****cks for a while.
muffles
26-10-07, 12:00 PM
No :rolleyes:
Or am i just having a Blackadder "Mr Thickie" moment?!
"as time reaches infinity"?
how do we know it's reaching infinity? Infinity is infinite. It also doesn't exist, so how do we know that ANYTHING is reaching it :confused:
"derived from the roots of the systems characteristic equation"?
which is what exactly?! what is the systems characteristic equation that we need to take the root of? :confused:
however, it is now friday and therefore approaching beer time, which sadly is a finite time that shall end at some point before the evil root of 900 (measured in hours of the day that is known as monday).
unless of course, like me, you're off next week :D
How big is infinity? :lol: IIRC that's part of how two seemingly different infinite series' are actually equal :eek: although it's been a good 5 years since I last did maths so I might be wrong!
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