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Forum: Miscellaneous Math 2021-11-28, 12:39
Replies: 430
Views: 40,542
Posted By jnml
OMG, what's going on here? We're on a math forum,...

OMG, what's going on here? We're on a math forum, the conversation in this thread reminded me of a recently thought about
mathematical peculiarity and I shared the interesting result that was not...
Forum: Miscellaneous Math 2021-11-28, 10:02
Replies: 430
Views: 40,542
Posted By jnml
How in the world is this related to the...

How in the world is this related to the math-speak opening sentence "Let's have a population of size N, where N/2 are males and N/2 are females."?

Have you heard physics say "Let's assume a...
Forum: Miscellaneous Math 2021-11-28, 09:57
Replies: 430
Views: 40,542
Posted By jnml
You missed the point I was trying to make. It was...

You missed the point I was trying to make. It was not about male/female. You can imagine zero bits and one bits. Black and white
marbles, red and blue cubes, whatever.

I was talking about math...
Forum: Miscellaneous Math 2021-11-27, 09:38
Replies: 430
Views: 40,542
Posted By jnml
Let's have a population of size N, where N/2 are...

Let's have a population of size N, where N/2 are males and N/2 are females.

Let me guess the sex of a random person from this population and compare some possible approaches.

1) I'll always...
Forum: Math 2021-11-12, 08:14
Replies: 60
Views: 6,193
Posted By jnml
Which Fermat's idea do you mean? Note that, for...

Which Fermat's idea do you mean? Note that, for example, 4^2-3^2 = 7, a prime number.
Actually every odd prime can be expressed as a difference of squares [of natural numbers].
Forum: Miscellaneous Math 2021-08-18, 12:40
Replies: 45
Views: 3,346
Posted By jnml
The sum of reciprocals of 83\pi\over{296x^2}...

The sum of reciprocals of 83\pi\over{296x^2} converges to a similar number.

Coincidence? I don't think so /s
Forum: Miscellaneous Math 2021-08-18, 12:28
Replies: 430
Views: 40,542
Posted By jnml
More than once you're talking about some kind of...

More than once you're talking about some kind of ownership of some set of numbers.

I don't understand. What concept are you talking about?
Forum: Math 2021-07-01, 09:14
Replies: 28
Views: 5,320
Posted By jnml
Premium Aprils last longer.

Premium Aprils last longer.
Forum: Miscellaneous Math 2021-05-23, 20:07
Replies: 10
Views: 1,101
Posted By jnml
Nothing left to be found ;-) The above can...

Nothing left to be found ;-)

The above can be directly coded, but that'll have to wait for tomorrow at least.

Thank you!
Forum: Miscellaneous Math 2021-05-23, 19:54
Replies: 10
Views: 1,101
Posted By jnml
In case anyone is curious about the linear...

In case anyone is curious about the linear multiply algorithm, base of the previous version
of the Sqr implementation, I just added Mul in...
Forum: Miscellaneous Math 2021-05-23, 14:44
Replies: 10
Views: 1,101
Posted By jnml
Fixed in...

Fixed in https://gitlab.com/cznic/mathutil/-/commit/cc711c58e06ee90a8e4f6274d036ebcb72228db8, thanks again.
Forum: Miscellaneous Math 2021-05-23, 13:54
Replies: 10
Views: 1,101
Posted By jnml
It is not because I was not aware of this simpler...

It is not because I was not aware of this simpler solution in O(1) ;-)

The idea implemented in the linked code is about multiplying repdigits in linear time.
Squaring a Mersenne number (a...
Forum: Miscellaneous Math 2021-05-23, 13:29
Replies: 10
Views: 1,101
Posted By jnml
It does not. I think that with this identity it...

It does not. I think that with this identity it will no more work in linear time.
Forum: Miscellaneous Math 2021-05-23, 12:58
Replies: 10
Views: 1,101
Posted By jnml
Mersenne numbers can be squared in O(n)

I wanted to look at squares of Mersenne numbers.
Probably just reinventing the wheel, sharing it anyway.

tl/dr: Outperfoms big mul for Mersenne numbers > 64k bits.

Code (Go):...
Forum: Math 2021-04-15, 06:33
Replies: 10
Views: 7,452
Posted By jnml
"Size" is not well defined in this context....

"Size" is not well defined in this context. "Number of decimal" digits is, for example.

From a programmer's POV, I'd assume "size" to mean how much memory one needs
to store the number in a...
Forum: Miscellaneous Math 2021-03-20, 08:08
Replies: 58
Views: 2,641
Posted By jnml
:popcorn:

:popcorn:
Forum: FactorDB 2020-12-20, 10:18
Replies: 164
Views: 52,140
Posted By jnml
I don't follow. Linux program does not need any...

I don't follow. Linux program does not need any update to run on Windows nowadays,
IINM.

It's probably Windows that need to be updated to have WSL, if that's not the default.
Forum: FactorDB 2020-12-20, 08:29
Replies: 164
Views: 52,140
Posted By jnml
I'm not a Windows user, but I was under the...

I'm not a Windows user, but I was under the impression that nowadays Windows can run
any Linux binary.
Forum: GPU Computing 2020-12-19, 19:30
Replies: 27
Views: 3,738
Posted By jnml
My choice is Devuan (https://www.devuan.org/) for...

My choice is Devuan (https://www.devuan.org/) for the last year or so. Both at home and work.

It's systemd free, snap free and for some people that matters. Otherwise it's Debian based,
ie. the...
Forum: Math 2020-12-16, 10:29
Replies: 16
Views: 2,252
Posted By jnml
Please don't overreact. AFAICS, LaurV's comment...

Please don't overreact. AFAICS, LaurV's comment talked about no _person_ at all and
I believe having opinions about _ideas_ is always fine.
Forum: Miscellaneous Math 2020-12-10, 05:41
Replies: 20
Views: 2,819
Posted By jnml
Please quote those rules or provide a link. Never...

Please quote those rules or provide a link. Never heard this before, genuinely want to learn
about them. Thanks.

(Searched the forum, failed to find it.)
Forum: Miscellaneous Math 2020-09-04, 07:05
Replies: 1
Views: 1,521
Posted By jnml
False, true or well known?

Given prime [$]p[/$] and [$]M_p = 2^p-1[/$]:

If [$]M_p-3[/$] is not a quadratic residue modulo [$]M_p[/$] then [$]M_p[/$] is composite.

Alternative, stronger version:

[$]M_p[/$] is prime iff...
Forum: Miscellaneous Math 2020-08-16, 13:35
Replies: 9
Views: 2,693
Posted By jnml
It's fine if you prefer to keep the PDF to just...

It's fine if you prefer to keep the PDF to just yourself.

It's fine if you prefer to sell it for money.

It's bad to "publish" it for free - but at a site that requires registration and or...
Forum: Miscellaneous Math 2020-07-22, 08:11
Replies: 57
Views: 24,005
Posted By jnml
I see his posts as direct and honest. But more...

I see his posts as direct and honest. But more importantly, informed. Even when they're coming with no sugar coating

I object to threatening him with a life-long ban for that.
Forum: Miscellaneous Math 2020-06-23, 13:53
Replies: 59
Views: 11,198
Posted By jnml
This is what happens when you invent a notation...

This is what happens when you invent a notation but you keep its meaning to yourself.

Please explain and define the notation you're using. Don't let people guess the meaning.

For example , all...
Showing results 1 to 25 of 185

 
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