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#151 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.

Comments and suggestions welcome too.

#152 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.

See Definition of Coefficient

Let me know if you feel it can be improved.

#153 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?

#154 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."

#155 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).

How about

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

With an example.

#156 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.

How about

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

#157 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 ... ?

#158 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?

How about in

Are a, b and c all coefficients?

(I want the simplest accurate definition.)

#160 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.

#161 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.

Suggestions and comments also welcome.

#162 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.

#164 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.

#166 Re: Maths Is Fun - Suggestions and Comments » Forum Upgrade 1.5.6 » 2014-05-17 21:45:54

Bobbym is in, yay!

Default theme is now Air, and I upgraded 'SleekBlue' users to it.

Forum is currently not accepting new members or Guest posts as we got a lot of spam.

I will work on fixes to Search, Spam, etc as time goes by (days most likely).

Keep posting!

#167 Re: Maths Is Fun - Suggestions and Comments » Forum Upgrade 1.5.6 » 2014-05-17 18:34:55

Hmm... is that a feature or a bug smile

Thank you, will look into it.

I am going to have a rest now as I have been working on this all day. Look forward to lots of things to tackle when I get back.

#168 Re: Maths Is Fun - Suggestions and Comments » Forum Upgrade 1.5.6 » 2014-05-17 18:13:21

New version installed. Latex seems to work. Search does not work at the moment. Many things to check.

#169 Re: Maths Is Fun - Suggestions and Comments » Forum Upgrade 1.5.6 » 2014-05-17 18:07:28

New version installed. Latex seems to work. Search does not work at the moment. Many things to check.

#170 Re: Maths Is Fun - Suggestions and Comments » Forum Upgrade 1.5.6 » 2014-05-12 11:04:41

Yes, nearly ready. Just need to check a few more things.

#171 Re: Maths Is Fun - Suggestions and Comments » Forum Upgrade 1.5.6 » 2014-05-10 18:41:49

I am getting some success in displaying the images (but not uploading etc). I will continue working on it.

The problem is that the code is so different between versions, this is what a file comparison looks like:
uW1CwGx.gif

#172 Re: Maths Is Fun - Suggestions and Comments » Forum Upgrade 1.5.6 » 2014-05-09 20:46:50

Agnishom wrote:

How many images are there in all?

Don't know exactly, they are in subfolders, with sub-subfolders of thumbnails, maybe 5000 give or take thousands.

#173 Re: Maths Is Fun - Suggestions and Comments » Forum Upgrade 1.5.6 » 2014-05-09 14:48:50

We have all the uploaded images. They are neatly sorted into folders by post id. We may not be able to upload new ones but I feel we can come up with a way to preserve the old ones.

#174 Re: Maths Is Fun - Suggestions and Comments » Forum Upgrade 1.5.6 » 2014-05-09 13:58:12

Lets say a post is missing the uploaded file xyz.gif, then find xyz.gif in the 99Mb zip file, drag and drop it into (say) imgur, which gives you a link. Put that link in place of the missing file.

There may be better ways, though.

#175 Re: Maths Is Fun - Suggestions and Comments » Forum Upgrade 1.5.6 » 2014-05-09 11:27:44

Have zipped up the folder containing all images (99 Mb) and am downloading it now for safekeeping.

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