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Did anyone miss me?
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Sir Hamster of Elderberry
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PostPosted: Thu Jul 08, 2010 5:50 pm    Post subject: Reply with quote

LOONEYS! Very Happy

ni! i!u
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She Turned Me Into A Newt
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PostPosted: Sun Jul 11, 2010 7:25 am    Post subject: Reply with quote

Oh, now we see the violence inherent in the system. He's repressin' me! Did you see him repressin' me?
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Killerrabbit
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PostPosted: Mon Jul 12, 2010 1:53 pm    Post subject: Reply with quote

I saw nothing. NOTHING!

Ni
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PhastPhred
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Joined: 22 Mar 2006
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PostPosted: Mon Jul 12, 2010 1:56 pm    Post subject: Reply with quote


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KWSN-HoC
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PostPosted: Tue Jul 13, 2010 2:18 am    Post subject: Reply with quote

LOL Laughing

Sgt. Schultz is legendary ..... even in the german version.

Cheers

HoC
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'My name is Homer from Borg. Resistance is fu ..... Oh doughnuts!'


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Fart in your gen direxion
I am the goatse.cx guy
Prince


Joined: 24 May 2002
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Location: Regrettably for you, I'm Upwind in Upstate N.Y.

PostPosted: Wed Jul 21, 2010 9:12 pm    Post subject: Re: Did anyone miss me? Reply with quote

She Turned Me Into A Newt wrote:
I offer a hearty Ni! to you Loonies!


I Fart in your specific direction #ni-1 !
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Ni ! Ni !

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Sir Fart

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Sir Hamster's Goat
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PostPosted: Wed Jul 21, 2010 9:39 pm    Post subject: Reply with quote

Sir Hamster of Elderberry wrote:
LOONEYS! Very Happy

ni! i!u


BAAAA!
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mohrorless
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PostPosted: Fri Jul 23, 2010 8:15 am    Post subject: Reply with quote

Shocked
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#Usa


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Sir Hamster of Elderberry
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Joined: 20 May 2002
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PostPosted: Fri Jul 23, 2010 1:06 pm    Post subject: Reply with quote

Darn Goat! I just missed him again!
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mohrorless
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PostPosted: Sat Jul 24, 2010 9:03 am    Post subject: Reply with quote

Silly goat
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PhastPhred
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PostPosted: Sat Jul 24, 2010 12:26 pm    Post subject: Reply with quote

mohrorless wrote:
Silly goat


Goats are for KIDS!
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Michelle
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PostPosted: Sun Jul 25, 2010 3:47 am    Post subject: Re: Did anyone miss me? Reply with quote

She Turned Me Into A Newt wrote:
I offer a hearty Ni! to you Loonies!


Miss that little bobbing bottom? Nah! Wink


THWAACK!

Of course we missed you.

#ni-1
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Sir Hamster's Goat
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PostPosted: Mon Jul 26, 2010 8:58 am    Post subject: Reply with quote

BLEEEEAAAAT MEEEE!
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KD0711
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Joined: 25 Apr 2006
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PostPosted: Thu Feb 09, 2017 4:07 pm    Post subject: Reply with quote

She Turned Me Into A Newt wrote:
Perhaps you were not aware that mathematics reawakened in Western Europe in the 13th century. At that time works in mathematics were translated from the Arabic into Latin allowing Western European scholars to learn about the medieval Arabic-language mathematics and the older Greek mathematics, such as Euclid's Elements. In all this mathematics, only positive numbers were considered to be numbers. Negative numbers were not yet accepted as entities. (Some ancient cultures, including that of China and India, accepted negative numbers, but not the ones mentioned above.)
Solution of quadratics. With negative numbers we understand that every quadratic equation in the variable x can be written in the form


ax2 + bx + c = 0,
where a, b, and c are constants. We also know that the general solution is given by the quadratic formula:


x = –b ±√(b2 – 4ac)
--------------------------------------------------------------------------------
2a

where there are two distinct real solutions if the discriminant b2 – 4ac is positive, one double real solution if the discriminant is 0, and no real solutions if the discriminant is negative.

Back in the 15th century, this was not understood. Instead, quadratic equations were classified into four different kinds depending on the signs of the coefficients a, b, and c. Since the leading coefficient a is not zero in a quadratic equation, you can always divide by it to get an equivalent quadratic equation where a equals 1, that is, x2 + bx + c = 0. This one form gives rise to four forms when you move the negative terms to the other side of the equation and when you drop zero terms from the equation:

x2 = c
x2 + bx = c
x2 + c = bx
x2 = bx + c

There are other forms, but either they have no solutions among the positive numbers or else they can be reduced to linear equations. Each of these forms required a different form of a solution. With hindsight, we see that the 15th century solutions are just special cases of the quadratic formula. One would think that the consolidation of four cases into one might be enough justification for accepting negative numbers, but apparently it wasn't. It seems to take a lot of time before people will extend their concept of number to include new entities.
Solution of cubics. Equations of the third degree are called cubic equations. The general form of a cubic is, after dividing by the leading coefficient,


x3 + bx2 + cx + d = 0,
As with the quadratic equation, there are several forms for the cubic when negative terms are moved to the other side of the equation and zero terms dropped.

Back in the 16th century it was a big deal to solve cubic equations. There was a great controversy in Italy between Cardano (1501-1576) and Tartaglia (1499-1557) about who should get credit for solving the cubic equation. Any book on the history of mathematics will go into the details of this fascinating controversy. What's interesting to us, though, is that negative numbers were becoming legitimatized, a deeper insight into equations was developed, and the first inkling of a complex number appeared. Incidentally, at this time symbolic algebra had not been developed, so all the equations were written in words instead of symbols!

Cardano, in his Ars Magna, finds negative solutions to equations, and he called these numbers "fictitious". He also noted an important fact connecting solutions of a cubic equation to its coefficients, namely, the sum of the solutions is the negation of b, the coefficient of the x2 term. At one other point, he mentions that the problem of dividing 10 into two parts so that their product is 40 would have to be 5 + √(–15) and 5 – √(–15).

Cardano did not go further into what later became to be called complex numbers than that observation, but a few years later Bombelli (1526-1572) gave several examples involving these new beasts. Here's one example. One of Cardano's cubic formulas gives the solution to the equation x3 = cx + d as


x = 3√(d/2 + √e) + 3√(d/2 – √e)
where e = (d/2)2 – (c/3)3). Bombelli used this to solve the equation x3 = 15x + 4 to get the solution


x = 3√(2 + √–121) + 3√(2 – √–121)
Now, the square root of –121 is not a real number; it's neither positive, negative, nor zero. Bombelli continued to work with this expression until he found equations that lead him to the solution 4. He determined that


√(2 + √–121) = 2 + √–1
√(2 – √–121) = 2 – √–1

and, therefore, the solution x = 4. This example is not given to show that Bombelli knew everything there is to know about complex numbers, rather to indicate that he was starting to understand them.

October 6th!


I am still contemplating my retort...

#ni-1
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NI! NI! NI!

KD0711
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mohrorless
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PostPosted: Sat Mar 04, 2017 8:03 pm    Post subject: Reply with quote

ouch
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#Usa


Keeper of the Unending keg of PGGBs
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