is it a hyperboloid?

@TedShifrin demonic?

@Bob I think it's some sort of hyperboloid I just can't find the exact term for it

@robjohn: We have a long history. When Alessandro was learning to drive, he was a menace and tried to run me over (virtually).

No, most definitely NOT a hyperboloid.

@geocalc33 You can look here: en.wikipedia.org/wiki/Hyperboloid

if it is not a hyperboloid then I do not know what it is

A hyperboloid is given by a quadratic equation.

I see

I need to change my answer to: I do not know

I did a linear algebra problem and I found it to be error prone. Easy to make a mistake.

Is that typical of linear algebra and matrices?

You have to learn not to be sloppy, yes.

any advice on how to learn how not to be sloppy?

I assume you mean an arithmetic error in row reduction or something?

something like that

and a copying error

Yup, you have to double-check yourself. And watch out for subtracting negatives.

I always told my students that on my homeworks and exams if things were coming out horrid they should be sure they'd made a mistake. I actually worked hard to get problems where the arithmetic would turn out nice. Of course, once you know how to do it by hand, you should use technology anyhow.

the problem is that if you use technology you forget how to do it

You shouldn't forget once you know how.

I remeber talking to a high school math teacher who had a student

who needed a calculator to add 1/2 + 1/3

and the student was taking honors pre-calc

Oh, yes. I've known plenty of college students like that, including — sadly — future elementary school teachers.

D:

this is why I believe the US is going down hill

I'm actually struggling to find a name for this shape

Well, we sure accelerated in a hurry the last 3+ years.

I wonder why.

I do not think we have accelerated in the last 3 years

accelerated downhill

Yes, accelerated downhill, barely recognizable as a nation.

It felt like the world's suddenly accelerating because of the brief era of consumerism after cold war. One can never judge timelines locally.

No, you're misinterpreting my use of the word, obviously.

I did automatically assume you meant accelerating downhill :)

But I am saying, US was always pretty bad.

In terms of not respecting education or intelligence, yes, perhaps.

There was nothing largescale warlike happening for a long time because of post cold war

Ah I wasn't considering other aspects

And, yes, waging wars that are none of our business has been horrendous.

You want me totally depressed? It's not even time for a martini yet.

We need to mind our business. We are not doing that.

Haha, no, no, Ted, not my intention.

I am not criticizing US specifically.

Oh, it is deserving of nothing but the starkest criticism. It's an abomination.

at least we have food

I am wondering who is going to be the next President.

Of course, but somehow this is because of capital -- there's less to do with the nation here and more to do with the fact that capital manifested itself in US.

Some do, geocalc. Plenty don't.

Capital has wrecked havoc throughout history; look at how India developed post-independence. We followed the globalization model of economy, and so we have it.

True, the United States of America is very unequal in terms of wealth

is that bad?

in the 19th century the distribution of wealth was even more uneven

and we had a very fast growth rate

I need to go now

thanks for the chat

bye

Cya

I can never fully convince myself which way it is; should history be viewed through the lens of material or through the lens of ideology?

Probably yes.

Haha

through the lens of $(\infty,1)$-categories

That's what we call rose colored glasses in my town, @Thorgott.

lol fair enough

I think history should be viewed through something

I am inclined to agree geocalc33

I think no one cared to name xyz=1

It has no name.

Cubic surfaces don't in general have names.

It's true. I discovered these.

Lmao

Took me a solid second to understand the joke

why didn't you give them names

Indeed :P

xD

why don't cubic surfaces in general have no names?

There are way too many different ones.

Yeah I was struggling to find a name geo

The only one I know with a standard name is (in projective space) the Fermat cubic $x^3+y^3+z^3+w^3=0$.

I did have a half-decent look around

oh I thought I got the joke but now I actually get the real joke

I googled "what is the name for xyz=1"

so what is xyzw=1?

wait why is xyz=1 a cubic surface?

shouldn't the degree be 3?

oh okay got it.