Math Is Fun Forum

mathxyz

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 1,053

Infinity - Infinity

Why does ∞ - ∞ = indeterminate form?

Last edited by mathxyz (2024-05-08 10:51:04)

Bob

Administrator

Registered: 2010-06-20

Posts: 10,460

Re: Infinity - Infinity

What do you think it is then?

Bob

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

mathxyz

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 1,053

Re: Infinity - Infinity

What do you think it is then?

Bob

It is zero or DNE.

Yes?

Bob

Administrator

Registered: 2010-06-20

Posts: 10,460

Re: Infinity - Infinity

Let A = the set of all positive wholes and B the set of all positive wholes except 23.

Then A - B = 23

Bob

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

mathxyz

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 1,053

Re: Infinity - Infinity

Let A = the set of all positive wholes and B the set of all positive wholes except 23.

Then A - B = 23

Bob

Your point here is???

Bob

Administrator

Registered: 2010-06-20

Posts: 10,460

Re: Infinity - Infinity

23 was an arbitrary choice. As any number can replace 23 that's why it's indeterminate.

Bob

---

Children are not defined by school ...........The Fonz
You cannot teach a man anything;  you can only help him find it within himself..........Galileo Galilei
Sometimes I deliberately make mistakes, just to test you!  …………….Bob

mathxyz

Member

From: Brooklyn, NY

Registered: 2024-02-24

Posts: 1,053

Re: Infinity - Infinity

23 was an arbitrary choice. As any number can replace 23 that's why it's indeterminate.

Bob

Very cool. Thank you.