### Re: How many holes does a straw have?

Posted:

**May 31st, 2018, 7:49 am**There are between 3 to 6 holes in breadYUM!!!!

brEad 3 holes

BrEad 4 holes

Bread 5 holes

BRead 6 holes

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Posted: **May 31st, 2018, 7:49 am**

There are between 3 to 6 holes in breadYUM!!!!

brEad 3 holes

BrEad 4 holes

Bread 5 holes

BRead 6 holes

Posted: **May 31st, 2018, 11:28 am**

Brilliant!

Posted: **June 3rd, 2018, 11:01 am**

Is it? I thought two spaces are topologically equivalent if one can be deformed into the other without ripping / cutting the surface.A straw is topologically equivalent to a donut. A donut has one hole. Therefore the straw has one hole.

Posted: **June 3rd, 2018, 1:13 pm**

I thought Topology was something that only existed in topologists' minds. What a pleasant, if not somewhat worrying surprise.Is it? I thought two spaces are topologically equivalent if one can be deformed into the other without ripping / cutting the surface.A straw is topologically equivalent to a donut. A donut has one hole. Therefore the straw has one hole.

Posted: **June 3rd, 2018, 1:34 pm**

Yes, that's the right definition.Is it? I thought two spaces are topologically equivalent if one can be deformed into the other without ripping / cutting the surface.A straw is topologically equivalent to a donut. A donut has one hole. Therefore the straw has one hole.

Now take a donut ring of dough, put a thin rolling pin through the middle, and roll the donut into a tube. Elongate the tube and you have a straw!

Posted: **June 3rd, 2018, 2:16 pm**

I only have homeomorphic dreams.I thought Topology was something that only existed in topologists' minds. What a pleasant, if not somewhat worrying surprise.

Posted: **June 3rd, 2018, 2:37 pm**

So you self-identify as a topologist?I only have homeomorphic dreams.I thought Topology was something that only existed in topologists' minds. What a pleasant, if not somewhat worrying surprise.

Is it? I thought two spaces are topologically equivalent if one can be deformed into the other without ripping / cutting the surface.

Posted: **June 3rd, 2018, 2:43 pm**

That is a very category theory like question.

But no, not at all. It's fascinating, like so many other things in maths and physics, but I have no talent for it/them.

But no, not at all. It's fascinating, like so many other things in maths and physics, but I have no talent for it/them.

Posted: **June 3rd, 2018, 4:47 pm**

I did topology at undergrad level from Cambridge PhD student of W. V. D. Hodge. But not my forte.That is a very category theory like question.

But no, not at all. It's fascinating, like so many other things in maths and physics, but I have no talent for it/them.

You're in the realm of Riemann and Poincare who eat straws for breakfast.

Unfortunately, constructing Cauchy sequences on a torus is very difficult.

Posted: **June 3rd, 2018, 4:55 pm**

What about automorphism, homomophism and diffeomorphisms?I only have homeomorphic dreams.I thought Topology was something that only existed in topologists' minds. What a pleasant, if not somewhat worrying surprise.

Is it? I thought two spaces are topologically equivalent if one can be deformed into the other without ripping / cutting the surface.

Some of you? catamorphism?

Posted: **June 3rd, 2018, 5:00 pm**

That is a very category theory like question.

But no, not at all. It's fascinating, like so many other things in maths and physics, but I have no talent for it/them.

Posted: **June 3rd, 2018, 7:02 pm**

Posted: **June 3rd, 2018, 11:27 pm**

Have you heard about the 10,000 hours theory?

But no, not at all. It's fascinating, like so many other things in maths and physics, but I have no talent for it/them.

(Why is an ellipsis popping up at the end of my posts? Some forum bug?)

...

Posted: **June 4th, 2018, 4:17 am**

Haven't heard about it so looked it up. I think it works for certain "mechanical" activities only. I don't even have the 10,000 hours (yet): my manager expects me to be at work every day, and after work:Have you heard about the 10,000 hours theory?

But no, not at all. It's fascinating, like so many other things in maths and physics, but I have no talent for it/them.

(Why is an ellipsis popping up at the end of my posts? Some forum bug?)

...

Posted: **June 4th, 2018, 9:08 am**

That 10K idea is based on Western ideology.

Learn from the mistakes of others, you may not live long enough to make them all yourself.

Learn from the mistakes of others, you may not live long enough to make them all yourself.