- Not sure if anyone on this list can answer this fellow's questions below. If

so, you can email him at eyeless.shiver _at_ gmail.com

=========================================================

I have a few questions for you all about matters along the lines of the subject.

I recently happened upon John Conway's famous Doomsday Algorithm; a precise and

efficient way to calculate the day of the week for any given date. Growing up,

I had always heard of so-called idiot or autistic savants who had such mental

abilities, maybe at the cost of high sensitivity and social incapability. A

month or two ago, I took it upon myself to look at how such techniques are

performed. Apparently John H. Conway's algorithm yields perhaps the fastest

results. Conway himself, for anyone unfamiliar with him, is professor of math

at Princeton, and one of the original minds responsible for the so-called

hacking movement, which is not malicious at all, as mainstream media might have

led us to believe, but instead concerned with free access to information and

free thought. As it turns out, the mathematical steps required for the esoteric

savant calculation skill are relatively simple. I was able to learn how to

calculate with some efficiency after an hour of looking online (wikipedia, more

specifically). Conway, also according to wikipedia, is able to calculate the

day of the week using his algorithm in two seconds. This next part is where

maybe someone in this society can help me. John practiced with a simple program

that quizzed him on the day of the week from his computer. Presumably, like

with anything, he went from relatively slow and clunky calculations to slick and

perfect ones. I'm interested in doing the same thing, and am wondering if

anyone on here knows of such a simple program that would fit this task.

Additionally, I'd like to raise the question about savantism in general. Is it

useful? Are fast counting methods and mental abilities of any real use? Should

such information be free for everyone, per the hackers' original intentions?

Should children be taught to calculate in such manners from a young age in

schools?

All the best to you all,

James

===================================================

Nathan Fields (Nth BarFields)

www.mentathlete.blogspot.com

www.facebook.com/nth.barfields

"Some critics think the Internet is making us dumb. The Internet fundamentally

changes the opportunity set. All the world’s knowledge and all the world’s

garbage are both just one search away. The Internet appears to exacerbate innate

tendencies — the smart get smarter while others will simply find new ways to

waste time or inflict harm.(Tom Vander Ark)"

[Non-text portions of this message have been removed] - Hey James/Nathan,
>The memoriad software has a random date generator on it:

http://www.memoriad.com/memoriadsoftware.asp

>George's Pegasus files create random dates as well (go on the files section of the group).

Date calculations have their roots in the days when mental calculators used to perform for people. Nowadays its a mental drag race and a useful way to learn about the concept of modular division. Other than that it's a party trick.

>Random.org is another good customisable source of dates: http://www.random.org/calendar-dates/

Human computation skills need only be taught so far (the most the system asks is that in theory a person should be able to add, subtract, multiply and divide anything with just a pencil and some paper and honestly what more do they need?).

There's no empirical evidence drills such as these help in academic performance but that's probably because experiments centralise around what is essentially recall (addition of single digit numbers very quickly) rather than understanding the logic behind it.

-My philosophy: Want results? Get people to enjoy it.

-Josh - FWIW, I developed this algorithm after watching "Rain Man" back in 1989.....

Example Date... 7/4/1976

Start by noting the month number, 7 for July. For each month, I remember a specific number...

January, October 0

February, March, November 3

April, July 6

May 1

June 4

August 2

September, December 5

Now, add the six for July to four, the day of the month in question. To ten, add 5/4 times the last two digits of the year. Ignore any fractional part of the answer.

10 + 76*5/4 = 10 + 95 = 105

Last, divide the final total by seven.

If remainder is 0, date was a sunday. If one, a monday etc.

So the Bicentennial of the USA took place on a Sunday.

Exception to rule: If month is January or February of a year divisible by four, subtract one from the total.

This method is good for the 1900 years or years any multiple of 400 years more or less than the 1900 range.

For the 2000 years ( 2400s or 1600s etc ) move the result back one day.

For the 2100 years ( 2500s or 1700s etc) etc move the result ahead four days

For the 2200 years ( 2600s or 1800s etc) move the result ahead two days.

If given dates in the same century, I can usually do this in a couple of seconds. Changing centuries is like shifting gears.

Jerry Newport

--- In MentalCalculation@yahoogroups.com, "JF" <jsh.flynn@...> wrote:

>

> Hey James/Nathan,

> >The memoriad software has a random date generator on it:

> http://www.memoriad.com/memoriadsoftware.asp

> >George's Pegasus files create random dates as well (go on the files section of the group).

> >Random.org is another good customisable source of dates: http://www.random.org/calendar-dates/

>

> Date calculations have their roots in the days when mental calculators used to perform for people. Nowadays its a mental drag race and a useful way to learn about the concept of modular division. Other than that it's a party trick.

>

> Human computation skills need only be taught so far (the most the system asks is that in theory a person should be able to add, subtract, multiply and divide anything with just a pencil and some paper and honestly what more do they need?).

>

> There's no empirical evidence drills such as these help in academic performance but that's probably because experiments centralise around what is essentially recall (addition of single digit numbers very quickly) rather than understanding the logic behind it.

>

> -My philosophy: Want results? Get people to enjoy it.

>

> -Josh

> - Hi to everybody,

Jerry, in my case I prefer to use

*January, October 5

February, March, November 1

April, July 4

May 6

June 2

August 0

September, December 3*

The only difference is that is good for the 2000 years or years any multiple

of 400 years more or less than the 2000 range. An excellent algorithm for

17th and 21st century it's good for mental calculator competitors since in

the contest we have dates in the range between 1600 and 2100 and my

algorithm is good for two out of the five centuries (1600 years and 2000

years) which is an advantage.

For the 1900 years ( 2400s or 1600s etc ) move the result ahead one day.

For the 1800 years ( 2500s or 1700s etc) etc move the result ahead three

days

For the 1700 years ( 2600s or 1800s etc) move the result ahead five days or

back two days, whichever is easier for you.

Regards,

Yusnier Viera.

On Fri, Jan 7, 2011 at 3:31 PM, Jerry <wholphin48@...> wrote:

>

>

>

> FWIW, I developed this algorithm after watching "Rain Man" back in

> 1989.....

>

> Example Date... 7/4/1976

>

> Start by noting the month number, 7 for July. For each month, I remember a

> specific number...

>

> January, October 0

> February, March, November 3

> April, July 6

> May 1

> June 4

> August 2

> September, December 5

>

> Now, add the six for July to four, the day of the month in question. To

> ten, add 5/4 times the last two digits of the year. Ignore any fractional

> part of the answer.

>

> 10 + 76*5/4 = 10 + 95 = 105

>

> Last, divide the final total by seven.

>

> If remainder is 0, date was a sunday. If one, a monday etc.

>

> So the Bicentennial of the USA took place on a Sunday.

>

> Exception to rule: If month is January or February of a year divisible by

> four, subtract one from the total.

>

> This method is good for the 1900 years or years any multiple of 400 years

> more or less than the 1900 range.

>

> For the 2000 years ( 2400s or 1600s etc ) move the result back one day.

>

> For the 2100 years ( 2500s or 1700s etc) etc move the result ahead four

> days

>

> For the 2200 years ( 2600s or 1800s etc) move the result ahead two days.

>

> If given dates in the same century, I can usually do this in a couple of

> seconds. Changing centuries is like shifting gears.

>

> Jerry Newport

>

>

> --- In MentalCalculation@yahoogroups.com<MentalCalculation%40yahoogroups.com>,

> "JF" <jsh.flynn@...> wrote:

> >

> > Hey James/Nathan,

> > >The memoriad software has a random date generator on it:

> > http://www.memoriad.com/memoriadsoftware.asp

> > >George's Pegasus files create random dates as well (go on the files

> section of the group).

> > >Random.org is another good customisable source of dates:

> http://www.random.org/calendar-dates/

> >

> > Date calculations have their roots in the days when mental calculators

> used to perform for people. Nowadays its a mental drag race and a useful way

> to learn about the concept of modular division. Other than that it's a party

> trick.

> >

> > Human computation skills need only be taught so far (the most the system

> asks is that in theory a person should be able to add, subtract, multiply

> and divide anything with just a pencil and some paper and honestly what more

> do they need?).

> >

> > There's no empirical evidence drills such as these help in academic

> performance but that's probably because experiments centralise around what

> is essentially recall (addition of single digit numbers very quickly) rather

> than understanding the logic behind it.

> >

> > -My philosophy: Want results? Get people to enjoy it.

> >

> > -Josh

> >

>

>

>

--

Yusnier Viera

cell: (786)712-4787

yusnierv@...

www.yusnierviera.com

[Non-text portions of this message have been removed] - Thanks, guys.

I've forwarded these messages to James. I wish I could have helped him more

directly, but I'm still rather a novice when it comes to mental calculating. In

any event, James says thanks.

Nathan Fields (Nth BarFields)

www.mentathlete.blogspot.com

www.facebook.com/nth.barfields

"Some critics think the Internet is making us dumb. The Internet fundamentally

changes the opportunity set. All the world’s knowledge and all the world’s

garbage are both just one search away. The Internet appears to exacerbate innate

tendencies — the smart get smarter while others will simply find new ways to

waste time or inflict harm.(Tom Vander Ark)"

________________________________

From: Yusnier Viera <yusnierv@...>

To: MentalCalculation@yahoogroups.com

Sent: Fri, January 7, 2011 1:53:46 PM

Subject: Re: [Mental Calculation] Fw: [OATHSociety] Re: Savantism, Hacker

Culture, and Calendrical Calculation

Hi to everybody,

Jerry, in my case I prefer to use

*January, October 5

February, March, November 1

April, July 4

May 6

June 2

August 0

September, December 3*

The only difference is that is good for the 2000 years or years any multiple

of 400 years more or less than the 2000 range. An excellent algorithm for

17th and 21st century it's good for mental calculator competitors since in

the contest we have dates in the range between 1600 and 2100 and my

algorithm is good for two out of the five centuries (1600 years and 2000

years) which is an advantage.

For the 1900 years ( 2400s or 1600s etc ) move the result ahead one day.

For the 1800 years ( 2500s or 1700s etc) etc move the result ahead three

days

For the 1700 years ( 2600s or 1800s etc) move the result ahead five days or

back two days, whichever is easier for you.

Regards,

Yusnier Viera.

On Fri, Jan 7, 2011 at 3:31 PM, Jerry <wholphin48@...> wrote:

>

>

>

> FWIW, I developed this algorithm after watching "Rain Man" back in

> 1989.....

>

> Example Date... 7/4/1976

>

> Start by noting the month number, 7 for July. For each month, I remember a

> specific number...

>

> January, October 0

> February, March, November 3

> April, July 6

> May 1

> June 4

> August 2

> September, December 5

>

> Now, add the six for July to four, the day of the month in question. To

> ten, add 5/4 times the last two digits of the year. Ignore any fractional

> part of the answer.

>

> 10 + 76*5/4 = 10 + 95 = 105

>

> Last, divide the final total by seven.

>

> If remainder is 0, date was a sunday. If one, a monday etc.

>

> So the Bicentennial of the USA took place on a Sunday.

>

> Exception to rule: If month is January or February of a year divisible by

> four, subtract one from the total.

>

> This method is good for the 1900 years or years any multiple of 400 years

> more or less than the 1900 range.

>

> For the 2000 years ( 2400s or 1600s etc ) move the result back one day.

>

> For the 2100 years ( 2500s or 1700s etc) etc move the result ahead four

> days

>

> For the 2200 years ( 2600s or 1800s etc) move the result ahead two days.

>

> If given dates in the same century, I can usually do this in a couple of

> seconds. Changing centuries is like shifting gears.

>

> Jerry Newport

>

>

> --- In MentalCalculation@yahoogroups.com<MentalCalculation%40yahoogroups.com>,

> "JF" <jsh.flynn@...> wrote:

> >

> > Hey James/Nathan,

> > >The memoriad software has a random date generator on it:

> > http://www.memoriad.com/memoriadsoftware.asp

> > >George's Pegasus files create random dates as well (go on the files

> section of the group).

> > >Random.org is another good customisable source of dates:

> http://www.random.org/calendar-dates/

> >

> > Date calculations have their roots in the days when mental calculators

> used to perform for people. Nowadays its a mental drag race and a useful way

> to learn about the concept of modular division. Other than that it's a party

> trick.

> >

> > Human computation skills need only be taught so far (the most the system

> asks is that in theory a person should be able to add, subtract, multiply

> and divide anything with just a pencil and some paper and honestly what more

> do they need?).

> >

> > There's no empirical evidence drills such as these help in academic

> performance but that's probably because experiments centralise around what

> is essentially recall (addition of single digit numbers very quickly) rather

> than understanding the logic behind it.

> >

> > -My philosophy: Want results? Get people to enjoy it.

> >

> > -Josh

> >

>

>

>

--

Yusnier Viera

cell: (786)712-4787

yusnierv@...

www.yusnierviera.com

[Non-text portions of this message have been removed]

[Non-text portions of this message have been removed]