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

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**MathsIsFun**- Replies: 3

When things get quiet over the next few days I plan to update some server software. It will hopefully have no impact on the forum but there is always the chance that something will go awry. If so I will do my best to get it back to normal again.

Hi ngolden, how can I help?

(I am not sure why the contact form is not working for you, we get plent of messages that way. I just checked and it works OK for me.)

It is just the server trying to sort out spam vs real. Nothing to do with you exactly.

Without the spam protection we would be inundated with robot posts, and they come in all types so there are literally 100s of rules (you could have hit any 1 of them).

It is super neat isn't it?

**MathsIsFun**- Replies: 5

What do you think of this page?

Thanks guys.

Thanks!

The reason for the little story is that most people think "Big Bang" which gives them a false idea of a central expansion point, and I want them to know the Universe is more elegant than that.

Isn't length contraction just a way of handling certain problems and not really a thing?

And how do I work E=mc² into it?

**MathsIsFun**- Replies: 5

I have drafted an Introduction to Relativity: Relativity

Criticisims, correction, comments all welcome.

I want to get it right before publishing on website!

Very much missed.

Wonderful

Thanks ganesh!

No offence Monox! I am not sure what you mean by equal halves though.

Thanks Guys!

**MathsIsFun**- Replies: 6

Made a new page: Pythagoras Theorem in 3D

Any suggestions or comments?

Exactly right.

Spam is an annoyance that we always have to fight.

But we also want to allow well established members to talk about other sites.

Imagine you are in a group of friends and someone just turns up trying to sell you something (versus a friend telling you about things).

**MathsIsFun**- Replies: 3

A new page: Sampling

Comments/suggestions anyone?

**MathsIsFun**- Replies: 5

Happy New Year to All

You are welcome Bob

A side note on the grapher: you can sum any function you want, not just sine and cosine.

Thanks!

**MathsIsFun**- Replies: 5

Just finished this page: Fourier Series

Please let me know what you think, and if there are any errors at all.

**MathsIsFun**- Replies: 2

Have a try of the Correlation Calculator and let me know what you think.

Does it work well? Any ideas for improvement?

Thank you!

**MathsIsFun**- Replies: 2

A screenshot of the error might help us find out what is wrong