Discussion about math, puzzles, games and fun. Useful symbols: ÷ × ½ √ ∞ ≠ ≤ ≥ ≈ ⇒ ± ∈ Δ θ ∴ ∑ ∫ π -¹ ² ³ °

You are not logged in.

- Topics: Active | Unanswered

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

Hi ;

Can anyone explain me these 4 steps

How

Dy=£y

Dx~~dx

F (x+£x)~~f(x)+dy

Dy=f (x)£x

Math !!!!.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Hi;

This is what your post looks like on my browser:

Now what on earth is that saying?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

Haha delta is £ because there is no symbol in my mob

Math !!!!.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

And the two squiggly lines?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

~~ is approximately equal to

Math !!!!.

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

Hehe ...,,,, sorry for this how I write symbols

Math !!!!.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Are you defining Dy as

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

δ

Math !!!!.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

What does that symbol mean?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

I don't know how dy=δy

Math !!!!.

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

Delta is δ

Math !!!!.

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

squiggly ???

Sizzling

Math !!!!.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

You usually see it like this:

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

And others? ?? Things

Math !!!!.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

In numerical analysis you would see lots of relationships between delta x and dx. In fact, we often replace the differential with a finite difference. But the rest of that is still a hopeless bit of jargon to me. For one thing, you need to define δ.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**bob bundy****Moderator**- Registered: 2010-06-20
- Posts: 7,969

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

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

bobbym wrote:

For one thing, you need to define δ.

In our country δx=delta x

Math !!!!.

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

Tell???

Math !!!!.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Dy and Dx should probably be dy and dx.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

Means Dy and Dx should probably be dy and dx.

Math !!!!.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Now did you look at the page bob bundy recommended?

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

I know this thing but see steps of approximation

Math !!!!.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

It might help if you were to say where this came from.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline

**Zeeshan 01****Member**- Registered: 2016-07-22
- Posts: 516

IN MY pRECIOUS BOOK OF ENGINEERING CHAPTER 3 INTEgration

3.1 ex

Math !!!!.

Offline

**bobbym****bumpkin**- From: Bumpkinland
- Registered: 2009-04-12
- Posts: 109,606

Do you have the title and the author? Of course, you have not copied it correctly. No book, no matter how bad would ever do such a bad job at notation.

**In mathematics, you don't understand things. You just get used to them.****If it ain't broke, fix it until it is.**** Always satisfy the Prime Directive of getting the right answer above all else.**

Offline