## Posts Tagged ‘conjecture’

### Math forever? How can you start loving math?

Posted on: April 12, 2015

Math forever? How can you start loving math?

Imagine you’re in a bar, or a club, and you start talking to a woman, and after a while this question comes up: “So, what do you do for work?”  (The most dreaded question I expect in a casual conversation)

And since you think your job is interesting, you say: “I’m a mathematician.” (Laughter)

Then 33.51% of women, in that moment, pretend to get an urgent call and leave.

And 64.69% of women desperately try to change the subject and leave.

Another 0.8%, probably your cousin, your girlfriend and your mom, know that you work in something weird but don’t remember what it is. (Laughter)

And then there’s  1% who remain engaged with the conversation.

And inevitably, during that conversation one of these two phrases come up:

A) “I was terrible at math, but it wasn’t my fault. It’s because the teacher was awful.” Or

B) “But what is math really for?”

When someone asks you what math is for, they’re not asking you about applications of mathematical science.

They’re asking you, why did I have to study that bullshit I never used in my life again

That’s what they’re actually asking. So when mathematicians are asked what math is for, they tend to fall into two groups:

1. 54.51% of mathematicians will assume an attacking position, and

2. 44.77% of mathematicians will take a defensive position.

There’s a strange 0.8%, among which I include myself.

Who are the ones that attack? The attacking ones are mathematicians who would tell you this question makes no sense, because mathematics have a meaning all their own a beautiful edifice with its own logic — and that there’s no point in constantly searching for all possible applications.

What’s the use of poetry? What’s the use of love? What’s the use of life itself? What kind of question is that?

Hardy, for instance, was a model of this type of attack. And those who stand in defense tell you, Even if you don’t realize it, math is behind everything.” (Laughter)

Those guys, they always bring up bridges and computers. “If you don’t know math, your bridge will collapse.”

It’s true, computers are all about math. And now these guys have also started saying that behind information security and credit cards are prime numbers.

These are the answers your math teacher would give you if you asked him. He’s one of the defensive ones.

Okay, but who’s right then?

Those who say that math doesn’t need to have a purpose, or those who say that math is behind everything we do?

Actually, both are right.

But remember I told you I belong to that strange 0.8 percent claiming something else? So, go ahead, ask me what math is for. Audience: What is math for?

Eduardo Sáenz de Cabezón: Okay, 76.34% of you asked the question, 23.41 percent didn’t say anything, and the 0.8 percent — I’m not sure what those guys are doing.

Well, to my dear 76.31% — it’s true that math doesn’t need to serve a purpose, it’s true that it’s a beautiful structure, a logical one, probably one of the greatest collective efforts ever achieved in human history.

But it’s also true that there, where scientists and technicians are looking for mathematical theories that allow them to advance, they’re within the structure of math, which permeates everything.

It’s true that we have to go somewhat deeper, to see what’s behind science.

Science operates on intuition, creativity. Math controls intuition and tames creativity.

Almost everyone who hasn’t heard this before is surprised when they hear that if you take a 0.1 millimeter thick sheet of paper, the size we normally use, and, if it were big enough, fold it 50 times, its thickness would extend almost the distance from the Earth to the sun.

Your intuition tells you it’s impossible. Do the math and you’ll see it’s right. That’s what math is for.

It’s true that science, all types of science, only makes sense because it makes us better understand this beautiful world we live in.

And in doing that, it helps us avoid the pitfalls of this painful world we live in. There are sciences that help us in this way quite directly.

Oncological science, for example. And there are others we look at from afar, with envy sometimes, but knowing that we are what supports them.

All the basic sciences support them, including math. All that makes science, science is the rigor of math. And that rigor factors in because its results are eternal.

You probably said or were told at some point that diamonds are forever, right? That depends on your definition of forever!

A theorem — that really is forever. (Laughter) The Pythagorean theorem is still true even though Pythagoras is dead, I assure you it’s true.

Even if the world collapsed the Pythagorean theorem would still be true. Wherever any two triangle sides and a good hypotenuse get together the Pythagorean theorem goes all out. It works like crazy.

Well, we mathematicians devote ourselves to come up with theorems. Eternal truths.

But it isn’t always easy to know the difference between an eternal truth, or theorem, and a mere conjecture. You need proof.

For example, let’s say I have a big, enormous, infinite field. I want to cover it with equal pieces, without leaving any gaps. I could use squares, right? I could use triangles. Not circles, those leave little gaps. Which is the best shape to use?

One that covers the same surface, but has a smaller border.

In the year 300, Pappus of Alexandria said the best is to use hexagons, just like bees do. But he didn’t prove it. The guy said, “Hexagons, great! Let’s go with hexagons!” He didn’t prove it, it remained a conjecture.

“Hexagons!” And the world, as you know, split into Pappists and anti-Pappists, until 1700 years later when in 1999, Thomas Hales proved that Pappus and the bees were right — the best shape to use was the hexagon. And that became a theorem, the honeycomb theorem, that will be true forever and ever, for longer than any diamond you may have.

But what happens if we go to 3 dimensions?

If I want to fill the space with equal pieces, without leaving any gaps, I can use cubes, right? Not spheres, those leave little gaps.

What is the best shape to use? Lord Kelvin, of the famous Kelvin degrees and all, said that the best was to use a truncated octahedron which, as you all know — (Laughter) — is this thing here!

Come on. Who doesn’t have a truncated octahedron at home? (Laughter) Even a plastic one.

“Honey, get the truncated octahedron, we’re having guests.” Everybody has one!  But Kelvin didn’t prove it. It remained a conjecture — Kelvin’s conjecture.

The world, as you know, then split into Kelvinists and anti-Kelvinists (Laughter) until a hundred or so years later, someone found a better structure.

Weaire and Phelan found this little thing over here, this structure to which they gave the very clever name “the Weaire-Phelan structure.”

It looks like a strange object, but it isn’t so strange, it also exists in nature. It’s very interesting that this structure, because of its geometric properties, was used to build the Aquatics Center for the Beijing Olympic Games.

There, Michael Phelps won eight gold medals, and became the best swimmer of all time. Well, until someone better comes along, right?

As may happen with the Weaire-Phelan structure. It’s the best until something better shows up.

But be careful, because this one really stands a chance that in a hundred or so years, or even if it’s in 1700 years, that someone proves it’s the best possible shape for the job. It will then become a theorem, a truth, forever and ever. For longer than any diamond.

So, if you want to tell someone that you will love them forever you can give them a diamond. But if you want to tell them that you’ll love them forever and ever, give them a theorem! (Laughter)

But hang on a minute! You’ll have to prove it, so your love doesn’t remain a conjecture.

Reine Azzi shared this link on FB

For the love of math (I sucked at it) in Spanish with English subtitles.

With humor and charm, mathematician Eduardo Sáenz de Cabezón answers a question that’s wracked the brains of bored students the world over: What is math for?
He shows the beauty of math as the backbone of science — and shows that…
ted.com|By Eduardo Sáenz de Cabezón

### Scientific theories must be Falsifiable? Best indicator to sort out the pseudo-sciences

Posted on: February 23, 2015

Scientific theories must be Falsifiable? Best indicator to sort out the pseudo-sciences

If certain forbidden conditions arise, then the scientific theory can be said to be falsifiable. (Karl Popper).

If a theory cannot logically be refuted, which means it says nothing about reality, then it is vacuous, absurd. This theory does not speak about reality and it can be classified as a pseudo-science, like psycho-analysis and Marxist theories. Why?

Because the discovered things are observed Only after the event or session.

Many significant mathematical and logic theorems cannot be refuted and are fundamentally not directly related to reality around us: They are of abstract concerns.

Scientific predications should be refuted.

Scientific theory starts with bold conjectures and should stand up to rigorous tests that are meant to refute the theory.

Since inductive reasoning cannot be justified, then observations are not meant to support the “truth” of the conjectures but to try to refute them.

Basically, no matter how often the theory survives the tests, it still remains a conjecture, until it fails and should be rejected by the real scientists.

Many scientists tend to cling to the failed theory by trying to introduce ad hoc modifications with the purpose of protecting their niche of specialization that their livelihood is based upon.

It is alright to add modifications in the conjecture, as long as they are falsifiable and withstand the tests of falsification.

For a century now, the interpretation of data analysis of scientific experiments sets a margin of error at 5%, by consensus, for disproving a hypothesis.

The game is to state the opposite of the conjecture (hypothesis) that we strongly believe in so that this opposite hypothesis fails “significantly” and claim that the conjecture is still valid.

Obviously, if the consequences of the hypothesis are dangerous, such as in the medical field and treatment of diseases or safety behaviors, it is logically tantamount to decrease the error margin to below 5%.

Apparently, researchers are wary of adopting a lower level of 5% in order to resume their research on the same conjecture.

In many cases, scientists will do their best to find fault in the experiment procedure and processes, and the variables that they failed to control… just to maintain the well-trotted theory.

This is a very common behaviour, given that researchers plays within the accepted consensual paradigm (framework of investigation), in order to easily get grants for “further research” work.

It good to ponder on the case of the philosopher Imre Lakatos.

An astronomer is not willing to abandon the Newton’s theory on planetary movement. Each time his computation does not match the theory, he introduces additional conjectures such as other influencing factors (an invisible twin body, forces, magnetic clouds fields…) and asks for grants to send satellites, sophisticated advanced telescope and equipment to double check his conjecture and validate the original theory he is clinking at.

There are more complicated issues than refuting the conjecture.

We need to consider the initial conditions or premises and verify that they are compatible with the theory.

We need not to just hang on the current paradigm or framework in our investigation and get out of the comfort zone when our scientific credentials are well established. Otherwise, who is to take on the task of moving on and allowing science to progress in the right direction?

That a scientific theory must have a predictive power should not necessarily be a basis to abandon a theory when a couple predictions fail to materialize.

However, theories that have sustained frequent tests should not be merely considered as conjectures, but a phenomenon that is aching to a “truth”, a firm law. Otherwise, science will keep circling in the vicious process of trying to refute a well-tested and sound theory.

Note 1: Read “How to think like a Bat” by Peter Cave

Note 2: I conjecture that psycho-analysis can be transformed into a predictive scientific theory. The cases have accumulated and can be sorted out to discover the initial conditions or factors that affect a particular emotional disturbance.

Actually, experimented psychologists start with a conjecture after a few sessions with the patient and turn around their hypothesis for confirmation. And this is a human behavioural problem even if scientists are trained to avoid the confirmation fallacy in their work.

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