Math Is Fun Forum
  Discussion about math, puzzles, games and fun.   Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ • π ƒ -¹ ² ³ °

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#1 Re: Maths Is Fun - Suggestions and Comments » Inverse Functions » 2016-07-30 11:49:31

Thanks everyone!

I will leave the page as it is until I can think of a way to simplify it without straying into "y=2x+3 becomes y=(x-3)/2" territory.

#2 Re: Maths Is Fun - Suggestions and Comments » Inverse Functions » 2016-07-29 10:59:44

The "graphing calculator" reasoning might be why Wolfram (ie Mathematica) uses  f-¹(x)

#3 Re: Maths Is Fun - Suggestions and Comments » Inverse Functions » 2016-07-29 09:57:14

Thanks Guys!

I found Wolfram uses f-¹(x): http://mathworld.wolfram.com/InverseFunction.html

It would be nice to simplify the page to f-¹(x) ... but in the intro I say "So the inverse of:   2x+3   is:   (y-3)/2" and that does not sit well with using f-¹(x)

Nor with the table of inverses as ganesh mentions.

#4 Maths Is Fun - Suggestions and Comments » Inverse Functions » 2016-07-28 13:34:46

MathsIsFun
Replies: 10

On this page: Inverse Functions

I have f(x) becoming f-¹(y)

But a reader has suggested it should be f-¹(x)   

It would certainly be simpler not swapping y for x. What is correct do you think?

#5 Re: Maths Is Fun - Suggestions and Comments » Reflection » 2016-07-27 17:32:54

bobbym wrote:

... and since I have no spoon that shiny ...

I polished it specially for the occasion!

I will mention The law of reflection, thanks ganesh.

#7 Re: Maths Is Fun - Suggestions and Comments » Sound Waves » 2016-07-26 22:37:46

I might put the typical hearing sensitivity graph just below the sound generator so people don't freak out though!

#8 Re: Maths Is Fun - Suggestions and Comments » Sound Waves » 2016-07-26 10:45:29

Thanks everyone! Excellent hearing, bobbym.

You may be in Internet Explorer, bob, it does not have a thing called "AudioContext" so my code doesn't make any sound.

#9 Maths Is Fun - Suggestions and Comments » Sound Waves » 2016-07-25 20:50:53

MathsIsFun
Replies: 6

Another in the Waves series: Sound Waves

Let me know any Suggestions and Comments

#11 Maths Is Fun - Suggestions and Comments » Introduction to Waves » 2016-07-25 10:28:22

MathsIsFun
Replies: 4

A new page for you guys to review: Introduction to Waves

(I have been working on a lot of pages on waves, this is the first.)

Comments, suggestions please.

#12 Re: Maths Is Fun - Suggestions and Comments » Types of Force » 2016-05-21 20:29:27

Thanks bobby and ganesh.

And bobby: the Romans were just that good. Great roads, too. But apart from concrete and roads what have they ever done for us?

#13 Maths Is Fun - Suggestions and Comments » Types of Force » 2016-05-20 19:27:05

MathsIsFun
Replies: 3

Another page for everyone to check out: Types of Force

Comments/suggestions welcome

#19 Re: Maths Is Fun - Suggestions and Comments » Gravity » 2016-04-16 13:34:21

I was thinking of a popup edit screen, one line per object, with mass, x and y position and velocity magnitude and direction (0-360 degrees). The animation would pause while editing. Can also delete a particle.

#20 Maths Is Fun - Suggestions and Comments » Gravity » 2016-04-13 17:52:15

MathsIsFun
Replies: 7

A new page on Gravity

Would value your feedback.

Any ideas on how to best present space-time curvature will be welcome!

Also help in tightening up the wording is welcome, too.

#23 Maths Is Fun - Suggestions and Comments » Force » 2016-03-25 15:22:19

MathsIsFun
Replies: 3

A new page: Force

Comments and suggestions please!

#25 Re: Dark Discussions at Cafe Infinity » Forum Dead? » 2016-03-20 10:01:01

With the rise of social media people spend a lot of time on Facebook, Twitter, Instragram, Snapchat. They are the online version of sports stadiums and shopping malls.

We are more like a Parisian Cafe. We have our regulars, who can often be seen dining here and discussing with their friends, and also people who just pop in for a coffee or pastry.

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