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Some people ask the question of what good is math?  What is the relationship between
math and physics?  Well, sometimes math leads.  Sometimes physics leads.  Sometimes they
come together because, of course, there’s a use for the mathematics.  For example,
in the 1600s Isaac Newton asked a simple question: if an apple falls then does the moon also
fall?  That is perhaps one of the greatest questions ever asked by a member of Homo sapiens
since the six million years since we parted ways with the apes.  If an apple falls, does
the moon also fall?  Isaac Newton said yes, the moon falls because
of the Inverse Square Law.  So does an apple.  He had a unified theory of the heavens, but
he didn't have the mathematics to solve the falling moon problem.  So what did he do? 
He invented calculus.  So calculus is a direct consequence of solving the falling moon problem. 
In fact, when you learn calculus for the first time, what is the first thing you do?  The
first thing you do with calculus is you calculate the motion of falling bodies, which is exactly
how Newton calculated the falling moon, which opened up celestial mechanics.
So here is a situation where math and physics were almost conjoined like Siamese twins,
born together for a very practical question, how do you calculate the motion of celestial
bodies?  Then here comes Einstein asking a different question and that is, what is
the nature and origin of gravity?  Einstein said that gravity is nothing but the byproduct
of curved space.  So why am I sitting in this chair?  A normal person would say I'm
sitting in this chair because gravity pulls me to the ground, but Einstein said no, no,
no, there is no such thing as gravitational pull; the earth has curved the space over
my head and around my body, so space is pushing me into my chair.  So to summarize Einstein's
theory, gravity does not pull; space pushes.  But, you see, the pushing of the fabric of
space and time requires differential calculus.  That is the language of curved surfaces, differential
calculus, which you learn in fourth year calculus. So again, here is a situation where math and
physics were very closely combined, but this time math came first.  The theory of curved
surfaces came first.  Einstein took that theory of curved surfaces and then imported
it into physics. Now we have string theory.  It turns out
that 100 years ago math and physics parted ways.  In fact, when Einstein proposed special
relativity in 1905, that was also around the time of the birth of topology, the topology
of hyper-dimensional objects, spheres in 10, 11, 12, 26, whatever dimension you want, so
physics and mathematics parted ways.  Math went into hyperspace and mathematicians said
to themselves, aha, finally we have found an area of mathematics that has no physical
application whatsoever.  Mathematicians pride themselves on being useless.  They love being
useless.  It's a badge of courage being useless, and they said the most useless thing of all
is a theory of differential topology and higher dimensions.
Well, physics plotted along for many decades.  We worked out atomic bombs.  We worked out
stars.  We worked out laser beams, but recently we discovered string theory, and string theory
exists in 10 and 11 dimensional hyperspace.  Not only that, but these dimensions are super. 
They're super symmetric.  A new kind of numbers that mathematicians never talked about evolved
within string theory.  That's how we call it “super string theory.”  Well, the
mathematicians were floored.  They were shocked because all of a sudden out of physics came
new mathematics, super numbers, super topology, super differential geometry. 
All of a sudden we had super symmetric theories coming out of physics that then revolutionized
mathematics, and so the goal of physics we believe is to find an equation perhaps no
more than one inch long which will allow us to unify all the forces of nature and allow
us to read the mind of God.  And what is the key to that one inch equation?  Super
symmetry, a symmetry that comes out of physics, not mathematics, and has shocked the world
of mathematics.  But you see, all this is pure mathematics and so the final resolution
could be that God is a mathematician.  And when you read the mind of God, we actually
have a candidate for the mind of God.  The mind of God we believe is cosmic music, the
music of strings resonating through 11 dimensional hyperspace.  That is the mind of God.
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Michio Kaku: Is God a Mathematician? 上帝是數學家?

1168 分類 收藏
ykk 發佈於 2013 年 6 月 2 日
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