Math Is Fun Forum

Lazernugget

Member

Registered: 2011-01-22

Posts: 47

Help please

Um....I don't need to know, but I feel like it's brain feeding time!

Could someone ((In layman's terms)) Describe what these symbols mean?

1) ≈
2) ⇒
3) ∈
4) Δ
5) ∴
6) ∑
7) ∫

When I know those I will be mathematically fit for future physics/astronomical equations!

-Lazernugget

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MATH......that is all.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help please

1) approximately equal

2)implication, implies

3) Is an element of.

4) delta - difference, discriminant

5) Therefore

6) sigma, sum of

7) integral sign

---

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.

Lazernugget

Member

Registered: 2011-01-22

Posts: 47

Re: Help please

Then could you ((In very spread out, un-complicated ways)) Show me first of all, How to use a sigma?

Great!

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MATH......that is all.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help please

Sigma is a notational device here is a typical usage:

Instead of saying 1 + 2 + 3 + 4 + 5 + 6 + 7 + 8 + 9 + 10 + ... +

The three dots mean goes on forever. Using sigma you would right.

---

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.

Lazernugget

Member

Registered: 2011-01-22

Posts: 47

Re: Help please

So the ∞ on top means 1+2+3+4+5+6......Then what is the "K" and the "K=1" about?

Then explain the Integral please...Then I will go to read my Trigonometry book...page 8...1% done....

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MATH......that is all.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help please

That means k starts at 1. On top that means infinity. So we are adding all the integers that are greater than 0! To treat the sigma as an operation and actually compute that sum requires calculus first and then something called the summation calculus.  These are in your future.

An integral ( sums too ) comes in two types, definite and indefinite. We can treat the indefinite type as the inverse to the derivative. The definite integral ( and I have seen other interpretations ), I think is best though of as the area under some curve.

Be careful with your use of the notation 3 dots is the accepted form.

---

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.

Lazernugget

Member

Registered: 2011-01-22

Posts: 47

Re: Help please

Cool! Thanks a lot bobbym! Now time to read........

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MATH......that is all.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help please

So you are done with 1% of that book. Good!

Care to tell me the title and author?

---

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.

Lazernugget

Member

Registered: 2011-01-22

Posts: 47

Re: Help please

Sure...It's called CK-12 Trigonometry by the CK-12 Foundation....I'm doing Functions and graph data right now....

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MATH......that is all.

bobbym

bumpkin

From: Bumpkinland

Registered: 2009-04-12

Posts: 109,606

Re: Help please

Very good! That back to studying you go. Good luck and feed your brain some trig.

---

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.