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-   -   Today, in myths! (https://www.mersenneforum.org/showthread.php?t=17494)

Dubslow 2013-02-02 07:55

[QUOTE=Batalov;327135]div is, where I come from, a divergence operator on a [FONT=CMR12]differentiable vector field.[/FONT]
[FONT=CMR12]The results is a [FONT=CMR12]scalar field.[/FONT]
[/FONT][/QUOTE]

Or more generally, it acts on a rank n tensor and returns a rank n-1 tensor :smile:

Brian-E 2013-02-11 11:18

Here in Europe we write today's date as 11/2/13.

11213 is the exponent of the 23rd Mersenne Prime.

LaurV 2013-02-11 11:39

[QUOTE=Brian-E;328953]Here in Europe we write today's date as 11/2/13.

11213 is the exponent of the 23rd Mersenne Prime.[/QUOTE]
The best post in the thread until now! :tu:

davar55 2013-02-11 18:17

The date 1/12/13 American style was posted one day late,
so we concede to the previous poster.

How long until the next perfectly Mersenne date ...?

chalsall 2013-02-11 18:28

[QUOTE=Brian-E;328953]Here in Europe we write today's date as 11/2/13.[/QUOTE]

Wouldn't it be more logical to give all dates in YYYYMMDD format?

At least, for the next 8936 years?

Brian-E 2013-02-11 18:57

[QUOTE=davar55;328987]The date 1/12/13 American style was posted one day late,
so we concede to the previous poster.[/QUOTE]
Oh! I missed your post about that date completely. You were first.
The number 11213 was actually in my mind because Hendrik Lenstra mentioned the number as his "favourite prime number" on a television show here a few days ago in which they were discussing GIMPS' new Mersenne Prime discovery. He said it was his favourite because it is the exponent of what was the largest known Mersenne Prime at the time when he was first studying number theory. He didn't note anything about today's date or January 12, though, and it was only when I had to write the date on something today that I made the connection.

[QUOTE=chalsall;328989]Wouldn't it be more logical to give all dates in YYYYMMDD format?

At least, for the next 8936 years?[/QUOTE]
Yes, I prefer that method too. It makes ordering dates much simpler. But I think we need to allow some slack with writing dates if we're going to get much inspiration for this thread.:smile:

chalsall 2013-02-11 19:19

[QUOTE=Brian-E;328993]Yes, I prefer that method too. It makes ordering dates much simpler. But I think we need to allow some slack with writing dates if we're going to get much inspiration for this thread.:smile:[/QUOTE]

Let me then present this...

This next Valentine's day is going to be 2013.02.14.

Or, 14.02.13. Or 14.13.02. Or 13.14.02. Or 13.02.14...

The populous questioned the "year 2000 bug" where Cobol programmers had to "fix" the code where the year was only two digits. And billions of dollars were spent to prevent an error.

Strangely, the humans who complained are still only using two digits for the year....

Dubslow 2013-02-11 19:23

That's because we "know what we mean". Computers don't. (It's one of the few differences left between true intelligence and raw computational power. Like the infamous "DWIMNWIS" Perl module.)

chalsall 2013-02-11 19:39

[QUOTE=Dubslow;328998]That's because we "know what we mean". Computers don't. (It's one of the few differences left between true intelligence and raw computational power. Like the infamous "DWIMNWIS" Perl module.)[/QUOTE]

The transmitter has a great deal of responsibility to ensure the message is received correctly.

The receiver has the most work to do.

As an aside, Shannon was only dealing with deterministic systems and messages through noisy channels.

kladner 2013-02-11 20:51

[QUOTE=chalsall;328997]Let me then present this...

This next Valentine's day is going to be 2013.02.14.

Or, 14.02.13. Or 14.13.02. Or 13.14.02. Or 13.02.14...
[/QUOTE]

I am more connected to 2013.02.13, it being the day I was born.....and on a Friday, no less.

firejuggler 2013-02-11 21:17

lets change the title to
Meth, not even once (today)


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