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La divisione di Fibonacci

Geek   07.07.15  

Scoprire la Successione di Fibonacci dopo una divisione e altri curiosi modelli che emergono dalla sequenza di numeri, individuata dal matematico pisano, in cui ogni termine è la somma dei due che lo precedono e dove i primi due termini sono entrambi 1.

Divide the number 999,999,999,999,999,999,999,998,999,999,999,999,999,
999,999,999 into 1 and express the result as a decimal expansion, and you'll find the Fibonacci sequence presented in tidy 24-digit strings:

Successione di Fibonacci come risultato di una divisione

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17 equazioni che hanno cambiato la storia

Geek   27.12.14  

17 equazioni che hanno cambiato la storia

Business Insider racconta le 17 equazioni che hanno rivoluzionato il mondo. Dai logaritmi alla teoria del caos.

In 2013, mathematician and science author Ian Stewart published a book on 17 Equations That Changed The World. We recently came across this convenient table on Dr. Paul Coxon's twitter account by mathematics tutor and blogger Larry Phillips that summarizes the equations.

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Numeri di grandezza inconcepibile

Geek   08.12.14  

Il numero di Graham (Ronald Lewis Graham è tra i massimi esperti della matematica discreta) è considerato il primo numero di grandezza inconcepibile a essere usato in una seria dimostrazione matematica riguardo ad un problema della teoria di Ramsey (noto come problema di Graham) del quale rappresenta il limite superiore.
Il numero di Graham è così grande da subissare altri famosi numeri giganteschi come il googol, il googolplex e il megistone. È talmente grande che non è possibile dare un'idea delle sue dimensioni in termini non matematici senza sottostimarlo grandemente.

Moving up another level, exponentiation is iterated multiplication. Instead of saying 3 x 3 x 3 x 3, exponentiation allows me to bundle that string into the more concise 3^4.

Now, the thing is, this is where most people stop. In the real world, exponentiation is the highest operation we tend to ever use in the hyperoperation sequence. And when I was envisioning my huge googolplex^googolplex number, I was doing the very best I could using the highest level I knew -- exponentiation. On Level 3, the way to go as huge as possible is to make the base number massive and the exponent number massive. Once I had done that, I had maxed out.

The key to breaking through the ceiling to the really big numbers is understanding that you can go up more levels of operations -- you can keep iterating up infinitely. That's the way numbers get truly huge.

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Trova Spock risolvendo un problema matematico

Wow   21.09.14  

Trova Spock risolvendo un problema matematico

Spock si è perso e sarà compito della USS Enterprise ritrovarlo.
Il gioco sotto forma di problema matematico è stato originariamente pubblicato nel numero di maggio del 1983 della rivista Mathematics Teacher.
Ai giovani cadetti sono concessi 50 minuti per venire a capo dell'enigma con compasso e righello. Di seguito le istruzioni.

These are the voyages of the starship Enterprise. Its five-year mission—to explore strange new worlds, to seek out new life and new civilizations, to boldly go where no man has gone before. Wait a minute... Where's Spock? Spock? Spock? We've got to find Spock!

Your assignment, as Captain of this starship, is to help the crew of the Enterprise find its first officer, Spock. To do this, you must find ten new points on the accompanying chart. To find these points, follow in order the directions given. You have only fifty minutes before your command is revoked and you are reassigned to menial work. In following the directions, use the circled dots that are part of each object pictured. The Romulan neutral zone should be considered as a line.

1. Warp out oforbit to find point 1 midway between the Klingon ship and Earth.

2. To find point 2, proceed three-fourths of the distance from point 1 to Apollo's hand. (The point on Apollo's hand is on the watchband.)

3. To find point 3, change course by 45° in a counterclockwise direction, heading toward the Romulan neutral zone until you intersect the line that bisects the angle formed by the planet killer, the Tribble asteroid, and the Jupiter 2.

4. Take an immediate course change heading directly for the nova from point 3. You will find point 4 at a distance equal to three times the distance between the edge of the galaxy and the Enterprise.

5. The nova's heat drives your crew berserk, and they lose control of the ship. You find yourself at point 5 when you regain control. Point 5 is an equal distance from point 4, the time portal, and the planet killer.

6. From point 5, under sealed orders, proceed to point 6, which is at the edge of the Romulan neutral zone. Be sure to take the shortest route. (To keep your worksheet from getting too cluttered, you may want to move point 6 to a clean copy of the sheet.)

7. After accomplishing your mission at the edge of the Romulan neutral zone, return toward the Enterprise. To avoid a space radiation belt, you stop at point 7, which is one-third ofthe distance between point 6 and the Enterprise.

8. Starfleet Command instructs you to proceed to point 8 along a line that is parallel to the line between the time portal and the asteroid belt. You find point 8 on this line at a distance equal to the distance between point 7 and the Tribble asteroid.

9. Meteor shower! You veer off course to find point 9. It is where the perpendicular line from point 8 intersects the line between the Klingon ship and the planet killer.

10. You find Spock at point 10, which is equidistant from the three lines that connect point 9, the Tholian web, and the asteroid belt.

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