Math Is Fun Forum / Introduction to Calculus

MathsIsFun · 2012-07-16 15:40:37

What do you guys think of this page: Introduction to Calculus

bobbym · 2012-07-16 17:17:28

Hi MathsIsFun;

Very well done. I always enjoyed the manipulations using Δx instead of the dry differentiation rules. That was for me the reason calculus was fun. I think you have passed that on to anyone reading your page.

Also, I liked the use of Sam and Alex telling a story. But next time do not make them so friendly. Purists ( Galileo society ) are not going to appreciate the equation d = 5t^2.

bob bundy · 2012-07-16 17:40:08

Hi MathsIsFun,

I like this page a lot. It's a tough subject to explain simply, but you've managed it.

Two suggestions:

(i)

"BUT", says Alex, "again that is an average speed, since the jump, ... I want to know the speed at exactly 1 second, so I can set up the camera properly."

Would you consider re-wording this to

"BUT", says Alex, "again that is an average speed, since you started the jump, ... I want to know the speed at exactly 1 second, so I can set up the camera properly."

(ii) For the graph y = x^3 at x = 1.

Could you make one of your brilliant interactive demos to show the graph with a user movable point close to (1,1). At the side is a table showing the coordinates of the point (eg ( 1.1, 1.331), the differences in x and y, and the gradient of the chord joining them. The user moves the point closer and can see the values 'home in' on the gradient at the point.

Option to zoom in ?

And you could add a modified version to the Derivatives page.

Bob

MathsIsFun · 2012-07-16 17:40:52

Thanks bobby!

(Locally high gravity ... yes, that's it.)

ganesh · 2012-07-16 21:01:21

Hi MathsIsFun,

The page 'Introduction to Calculus' is well presented. Excellent work!

MathsIsFun · 2012-07-16 21:38:20

Thank you, ganesh

anonimnystefy · 2012-07-18 23:23:32

Hi MIF

It all makes sense now. My physics techer always used the terms when delta t approaches zero, but we never learned limits and derivatives applications.

I also suggest a page on integrals.

debjit625 · 2012-07-27 18:07:13

I am not expert in calculus,I am still learning...but that was basic and as all the lessons at MathIsFun site, its also easy to understand ,and I like it...

Just as anonimnystefy said ,in future it would be good to have a page which have all the links to calculus..like functions,limits,differential calculus,integral calculus,some special trigonometric relations,I know it will take time,so keep it up.

Good Luck

MathsIsFun · 2012-07-28 07:56:29

Thanks anonimnystefy and debjit625, will try to make more pages as time permits

anonimnystefy · 2012-07-28 08:01:45

That's great. Your website is getting better by the moment (who knew it was possible).

Last edited by anonimnystefy (2012-07-28 08:01:58)

bob bundy · 2012-07-28 16:49:26

hi MathsIsFun,

Did you see post #3 ?

Bob

MathsIsFun · 2012-07-28 18:00:09

No ... no I didn't ... it seems I was replying to bobby while you were posting!

Thank you for those wonderful suggestions, I will work on them.

bob bundy · 2012-07-28 20:06:30

I thought that might have happened.

Thanks.

Bob

anonimnystefy · 2012-07-28 21:00:11

bobbym wrote:
Hi MathsIsFun;

Very well done. I always enjoyed the manipulations using Δx instead of the dry differentiation rules. That was for me the reason calculus was fun. I think you have passed that on to anyone reading your page.

Also, I liked the use of Sam and Alex telling a story. But next time do not make them so friendly. Purists ( Galileo society ) are not going to appreciate the equation d = 5t^2.

Let's see you differentiate sin^11(x) using the delta x operator.

Last edited by anonimnystefy (2012-07-28 21:01:08)

MathsIsFun · 2012-08-02 13:34:23

I have finally finished a draft of the slope interactive (suggested by Bob).

Here it is: Slope of a Function at a Point

What do you think guys? How about the explanation?

bobbym · 2012-08-02 14:32:00

Hi MathsIsFun;

Can you provide an (x,y) pair for A and B?

MathsIsFun · 2012-08-02 16:34:11

Will work on it, good idea.

bob bundy · 2012-08-02 17:11:33

hi MathsIsfun,

That's brilliant and you have done it so quickly!!

I would like to be able to specify the (x,y) coordinates and 'lock them in' for the duration of the interaction.

eg. Say I want the gradient at (1,1) on y = x^2.
Point A becomes (1,1) at all zoom levels, and only B can be varied.

There would then need to be a 'change point A' button.

Secondly, could you have a 'display table' option so that the calculations can be seen. (see picture below)

I've shown a table with 3 lines of calculations but, for the page, I'm thinking a single line that changes as B is moved, would be best.

(and I've used dx only because I cannot make a 'delta' in Excel)

Many thanks,

Bob

Uploaded Images

MathsIsFun · 2012-08-07 09:33:01

New version! Slope of a Function at a Point (use refresh)

Shows coords of points, has a calculation box down below, and allows for setting coords of points using "edit" button.

Waddya think?

bobbym · 2012-08-07 16:50:24

Hi MathsIsFun;

Works for me! When I use the edit button it allows me to enter say (3,6). This is not on y = x^2. Could you make it that you only have enter the x value and the y value is computed automatically.

bob bundy · 2012-08-07 17:30:06

hi MathsIsFun,

Thanks for doing that.

I agree with bobbym about having the y coords calculated for you. As the aim of this demo is to show the chord gradient approaching the limit as the points get closer, it should always be points on the curve, so you might as well force that. (If someone just wants to play with gradients of any points you already have a demo for that on the straight line page)

When there are many decimals places, the display gets messy and the slope box isn't large enough to show the final calculation.

For my screen shot I had y = sin(x) and A = (1.570796,1)

(i) Do you really need to put the slope value on the graph when it is shown in the box anyway?

(ii) Could you make the box larger and maybe have a round off limit so the display is always clear?

Thanks,

Bob

Uploaded Images

anonimnystefy · 2012-08-30 22:19:12

I agree with bobbym and Bob. I also found out that when I put the points together, it says "Points too close".

Shivamcoder3013 · 2012-10-12 01:44:34

Brilliant. But frankly, I believe that you should create a counterpart site to MIF. That allows you to create more advanced tutorials on a slightly different site.

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#1 2012-07-16 15:40:37

Introduction to Calculus

#2 2012-07-16 17:17:28

Re: Introduction to Calculus

#3 2012-07-16 17:40:08

Re: Introduction to Calculus

#4 2012-07-16 17:40:52

Re: Introduction to Calculus

#5 2012-07-16 21:01:21

Re: Introduction to Calculus

#6 2012-07-16 21:38:20

Re: Introduction to Calculus

#7 2012-07-18 23:23:32

Re: Introduction to Calculus

#8 2012-07-27 18:07:13

Re: Introduction to Calculus

#9 2012-07-28 07:56:29

Re: Introduction to Calculus

#10 2012-07-28 08:01:45

Re: Introduction to Calculus

#11 2012-07-28 16:49:26

Re: Introduction to Calculus

#12 2012-07-28 18:00:09

Re: Introduction to Calculus

#13 2012-07-28 20:06:30

Re: Introduction to Calculus

#14 2012-07-28 21:00:11

Re: Introduction to Calculus

bobbym wrote:

#15 2012-08-02 13:34:23

Re: Introduction to Calculus

#16 2012-08-02 14:32:00

Re: Introduction to Calculus

#17 2012-08-02 16:34:11

Re: Introduction to Calculus

#18 2012-08-02 17:11:33

Re: Introduction to Calculus

#19 2012-08-07 09:33:01

Re: Introduction to Calculus

#20 2012-08-07 16:50:24

Re: Introduction to Calculus

#21 2012-08-07 17:30:06

Re: Introduction to Calculus

#22 2012-08-30 22:19:12

Re: Introduction to Calculus

#23 2012-10-12 01:44:34

Re: Introduction to Calculus

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