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## #1 Re: Maths Is Fun - Suggestions and Comments » Math vs Maths ... and more » 2014-08-11 23:26:49

chooipian wrote:

Standard Form and Scientific Notation?

bobbym wrote:

...what do they use for the other two? Boiled Or Denatured Makes Alcohol Sweeter? ...

Funny! But a good point, it would be nice to have one for BODMAS and BEDMAS.

## #2 Maths Is Fun - Suggestions and Comments » Math vs Maths ... and more » 2014-08-11 16:57:11

MathsIsFun
Replies: 7

A new page: Math vs Maths ... and more

Good page? Any mistakes? Do you have your own thoughts on this?

And any more examples for the second half would be appreciated.

## #3 Re: Maths Is Fun - Suggestions and Comments » some things lost after the upgrade » 2014-08-07 11:48:35

Hi Bob,

Thanks for that, I will look into how I might be able to repeat the tabs in this version.

I think imgur (or the like) is the best solution for image hosting at the moment.

## #4 Maths Is Fun - Suggestions and Comments » The Lottery » 2014-08-07 11:46:49

MathsIsFun
Replies: 3

Every so often we get people asking lottery type questions, so I thought I would make a page to try to help them understand how chance works etc.

Here is my draft: The Lottery

I would value your feedback, any mistakes you may find, and any suggestions for inclusions.

## #5 Re: Maths Is Fun - Suggestions and Comments » Homogeneous Differential Equations » 2014-07-04 23:09:31

Thanks bobby ... yes and yes: ±√(2x^2+c) − x is what I get now.

## #6 Maths Is Fun - Suggestions and Comments » Homogeneous Differential Equations » 2014-07-04 11:38:53

MathsIsFun
Replies: 4

And another in the Diff Eq series: Homogeneous Differential Equations

The main weakness in this page is no explanation of why they are "Homogeneous". I played with linking f(zx,zy) = z^n f(x,y) to dy/dx=F(x/y) form but failed. If anyone knows a user-friendly way of explaining why "Homogeneous" that would be nice.

Comments, suggestions and error checking welcome.

## #7 Re: Maths Is Fun - Suggestions and Comments » Solution of First Order Linear Differential Equations » 2014-07-04 11:10:12

Les is going to make some questions (with worked answers) for the bottom of the page.

## #8 Re: Maths Is Fun - Suggestions and Comments » Separation of Variables » 2014-07-04 11:06:32

Makes sense to me, I will put ±, thanks.

## #9 Re: Maths Is Fun - Suggestions and Comments » Separation of Variables » 2014-07-03 22:27:04

Have made changes to the page Separation of Variables

Is it looking better now? Did I miss any of your points in the rewrite?

## #10 Maths Is Fun - Suggestions and Comments » Solution of First Order Linear Differential Equations » 2014-07-03 22:22:50

MathsIsFun
Replies: 4

Continuing on with the series on Differential Equations: Solution of First Order Linear Differential Equations

Credit also goes to Les Bill Gates, a very capable mathematics teacher, for these pages.

I have been experimenting with a new way of formatting dy/dx etc, so if you notice any formatting issues could you screen print and post them so I can see (but try Refresh first).

I would value any feedback, ideas for improvement, and error checking!

## #12 Maths Is Fun - Suggestions and Comments » Separation of Variables » 2014-06-15 11:16:54

MathsIsFun
Replies: 12

Just finished off this Diff Eq page: Separation of Variables

It would be really nice if everyone could check it for mistakes before I make it live on the website.

## #13 Re: Maths Is Fun - Suggestions and Comments » Coefficient vs Constant » 2014-06-13 23:28:11

I have updated the definition to this:

I wrote:

Coefficient

A number used to multiply a variable.

Example: 6z means 6 times z, and "z" is a variable, so 6 is a coefficient.

Sometimes a letter stands in for the number.

Example: In ax² + bx + c, "x" is a variable, and "a" and "b" are coefficients.

Let me know if you feel it can be improved.

## #14 Re: Maths Is Fun - Suggestions and Comments » Coefficient vs Constant » 2014-06-13 09:56:51

ShivamS wrote:

However, we can't say that c is a coefficient in ax^2 + bx + c, but we can say it is in ax^2 + bx + cx^0.

That makes sense.

What does everyone think about that?

## #15 Re: Maths Is Fun - Suggestions and Comments » Coefficient vs Constant » 2014-06-12 20:27:20

OK, this is the new wording (so far), improvements welcome!

"The number (or other fixed value) part of a term, such as the 4 in 4y

A constant can also be though of as a coefficient. In ax² + bx + c, a, b and c are coefficients."

## #16 Re: Maths Is Fun - Suggestions and Comments » Coefficient vs Constant » 2014-06-12 19:48:27

Yes, it seems there is not consensus.

I do feel that having a constant also be a coefficient is more elegant (like a square being a rectangle).

"The number (or other fixed value) part of a term."

With an example.

## #17 Re: Maths Is Fun - Suggestions and Comments » Coefficient vs Constant » 2014-06-12 13:13:27

Yes, we normally draw a distinction between coefficient and constant, but then a constant is also a coefficient. A bit like a square is a rectangle.

A number (or other fixed value) used to multiply in algebra.

## #18 Re: Maths Is Fun - Suggestions and Comments » Coefficient vs Constant » 2014-06-12 12:30:58

So, what is a good and easy to understand (for adults and children) definition of coefficient ... ?

## #19 Maths Is Fun - Suggestions and Comments » Coefficient vs Constant » 2014-06-12 10:53:16

MathsIsFun
Replies: 46

On the website I define a coefficient as "A number used to multiply a variable"

So, in

3 and 7 are coefficients and 2 is a constant. But is 2 also a coefficient?

Are a, b and c all coefficients?

(I want the simplest accurate definition.)

## #20 Re: Maths Is Fun - Suggestions and Comments » Differential Equations - Introduction » 2014-06-10 18:48:46

Got a good one have you?

## #21 Re: Maths Is Fun - Suggestions and Comments » Differential Equations - Introduction » 2014-06-10 12:13:14

Thanks Guys!

bobbym wrote:

I thought the degree of an ODE was the power that the highest derivative was raised to.

Yes, will fix.

## #22 Maths Is Fun - Suggestions and Comments » Differential Equations - Introduction » 2014-06-10 10:55:26

MathsIsFun
Replies: 8

A new page: Differential Equations - Introduction

Could you please go over this with a fine-tooth comb and find any inaccuracies. In my attempt to simplify I may have gone too far.

## #23 Re: Dark Discussions at Cafe Infinity » Brittle math 2: Generalizing is a disease. » 2014-06-08 15:26:27

Just trying to think of everything. I meant that perhaps the length of the robot needs to be factored in, but it would be negligible compared to the course, and we could assume the front of the robot as the reference point for calculations anyway.

Length of robot?

## #25 Re: Dark Discussions at Cafe Infinity » Brittle math 2: Generalizing is a disease. » 2014-06-07 09:54:21

Hmm... the technicians would not likely fall into the "50 mph" trap, so we may assume their answer is technically correct.

So "stupid guy" must be including some other fact.