Mathematics

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pelmut
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Mathematics

Post by pelmut »

Different people have different ideas about mathematics, so you don't always get the same answer:

What is 2 + 2 ?

Mathematician:  4

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oldsalt1
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Re: Mathematics

Post by oldsalt1 »

13x 7=28

28 divided by 7 =13

13
13
13
13
13
13
13
-----
28

its simple math
PatJ
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Re: Mathematics

Post by PatJ »

Your math makes perfectly good sense to me.

13 X 7 =28

3X7 = 21
1X7= 7

7+21 = 28

Do I need to go on?
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denimini
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Re: Mathematics

Post by denimini »

pelmut wrote:
Tue Dec 08, 2020 11:52 am
Different people have different ideas about mathematics, so you don't always get the same answer:

What is 2 + 2 ?
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Mathematician: 5 proof
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Gardevoir
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Re: Mathematics

Post by Gardevoir »

denimini wrote:
Wed Dec 09, 2020 3:17 am
Mathematician: 5 proof
That is definitely a healthy amount of smoke and mirrors to hide a mathematical "mistake". Just looking at that image makes my eyes want to glaze over.
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Uncle Al
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Re: Mathematics

Post by Uncle Al »

Teaching Fractions 2020-12-09.jpg
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crfriend
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Re: Mathematics

Post by crfriend »

The United States should have joined the rest of the world and gone over to the metric system in the 1970s. We had the chance and blew it.
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pelmut
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Re: Mathematics

Post by pelmut »

crfriend wrote:
Wed Dec 09, 2020 10:11 am
The United States should have joined the rest of the world and gone over to the metric system in the 1970s. We had the chance and blew it.
Fractions are very useful for ordinary commerce; it is easy to work out a half or a third or a quarter of something that is measured in twelves.  I am glad I was brought up 'dual-standard', with currency measured in 12s and 20s; it needs a lot less thought to do some calculations and quick checks.  For temperature, Fahrenheit has no such advantage and I find Centigrade (or Celcius) much easier to relate to.

For scientific work, decimal has to be the only way.  I was in the last year to study electrical engineering in Imperial units and most of our time was wasted learning the units and the conversions between them instead of understanding the principles and applying them in a straightforward manner.  The older units have been of marginal use to me when studying historical engineering documents, but they must be a great hindrance to any practicing engineer lumbered with such an archaic system.

The engineer works to the nearest thou.
The carpenter works to the nearest eighth.
The shipwright works to the nearest ship.
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Jim
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Re: Mathematics

Post by Jim »

Gardevoir wrote:
Wed Dec 09, 2020 5:48 am
denimini wrote:
Wed Dec 09, 2020 3:17 am
Mathematician: 5 proof
That is definitely a healthy amount of smoke and mirrors to hide a mathematical "mistake". Just looking at that image makes my eyes want to glaze over.
Common error. (-1/2)^2=(1/2)^2 does not mean -1/2 = 1/2.
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oldsalt1
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Re: Mathematics

Post by oldsalt1 »

PatJ wrote:
Tue Dec 08, 2020 5:04 pm
Your math makes perfectly good sense to me.

13 X 7 =28

3X7 = 21
1X7= 7

7+21 = 28

Do I need to go on?
nope your math is perfect by the way do you have 2 10's for a 5
PatJ
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Re: Mathematics

Post by PatJ »

"nope your math is perfect by the way do you have 2 10's for a 5"t

No, but I have two sevens and two three that I'd be willing to trade you.
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Re: Mathematics

Post by Yonkas »

Even mathematicians don’t necessarily give the same answer. A number theorist or algebraist would tell you that 2 + 2 is means different things under different circumstances. But that doesn’t mean that truth is fungible.

Definitions matter, and deduction matters. R squared factors matter. Change point analysis matter. Recorded history matters. Radiological dating matters. There are some people that have opinions based off of nothing but personal preference, while there are others that have opinions based off of rigorous study, and responsible practices. It is folly to treat the two as equivalent.
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