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Get the Trachtenberg Book! (Speed Math)
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Get the Trachtenberg Book! (Speed Math)
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Take the first example 1+1=1. Well if it is a severely limited environment (from our perspective, as the object existing in that environment may very well be happy with its capabilities and existance) where for example we only have one bit to represent our math and that bit is a binary representation, so only 0 and 1 are valid numbers in our system, well 1+1 represents an overflow. The answer could be 1, but it could also be 0. Its pretty undefined to say it will always be 1, but then again, it may be always 1, it just depends on how it treats an overflow. And what of the '+'? What does the plus sign represent? How does it act? In binary math (everything is base 2): |
This argument is much simpler. In the base 2 world we have this:
When you say would 1 plus 1 be 5? Well say perhaps we gave another condition: Everything to the left and to the right of an equals sign represented a collection of numbers, and the equals sign shows membership. If we had that condition we would be saying redundantly, 1 and 1 are members of a set. 5 is also a member of a set. And both sets contain both at least one '1' and at least one '5'.
Can you think of a way to quickly calculate the square of a number in your head? Say someone said to you give me the square of 75. That's 75*75.... Got it yet? It turns out to be quite easy... In high school, I stumbled upon a quick formula and I used to earn extra lunch money by beating people on their TI-30 calculators (I used my brain). The answer is below but please read on for now....
I stumbled on a solution to long digit math that was easy to implement on a computer back in 1983 when I was a math major at CSU, Chico... After developing some theories related to it, I started asking around to see if anyone had knowledge of any of these theories... After a long search, I found out about Trachtenberg.... You can order the book here
As a POW in the World War, he came up with similar theories in math as a way to fight his mind from going insane from boredom. My theories turned out to be a specialized extension of his but I didn't pursue it any farther at that point because his were in themselves quite interesting.
In 1985, I received my Computer Science degree from CSU, Chico.
The case of 75*75 is solvable
using his methodology. Its quite simple:
1) 5*5 is 25 (save those)
2) 5*7 = 35 Now take 35*2 = 70 (save
that)
3) 7*7 = 49 (save this)
Now arrange it all:
25
70
49
---------------
5625 <-- Thats the answer!!!!!
Note we never had a carry greater than 2.... That in itself is
quite interesting. You can extend this
formula to any number of digits.
To solve this for 2 digits the actual formula is this: Picture 75 as being represented by 7*10+5*1.
This abstracts to a*10 + b*1 ==> So (10a+b)**2 ==>
100a**2 + 2*10ab + b**2
==> 100aa + 20ab + bb
so plugging in 75*75 ==> 100(7)(7) + 20(7)(5) + 5(5) ==> 4900 + 700 + 25 ==> 5625
You can derive the formula for 3 digits, and keep working until you
have your n*m formula...
It turns out with numbers ending in 5 there is an even simpler solution:
(n)* (n+1) + 25
Here n = 7
so its 7 * (7+1) + 25 ==> 7*8 + 25 --> 56 + 25 ==> 5625
Note the + isn't the + you are probably thinking of.
Its closer to an OR but not quite. If you were to picture the 56
being in one word (of a computer address space) and the 25 being in an
adjacent word. Putting the two words together would read 5625.....
Another interesting point is noting the '1'. Where did the
1 come from, and what does it signify? Its interesting
to note this happens to be our carry digit... but why is it here?
What does it mean to fold it into the left side of the equation?
Is there a general scheme this can fit into?
This is the beginning of the theory for handling long number arithmetic with no roundoff errors.
Anytime the formula asks you to save a quantity (like 5*5) its like putting it off in a 'word' of the computer....
The 2x2 Pattern |
The 2x3 Pattern
The 3x2 Pattern | The 3x3 Pattern | The 4x4 Pattern
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Here is a sample Public/Private Key generator program. have fun with it. Its a zip file so you will need a pkunzip program to expand the files.
Here is a rather simple password generator I wrote that runs on Windows NT and Windows 95. Its a zip file so you will have to use pkunzip to expand the files.
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Get the Trachtenberg Book! (Speed Math)
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