Number

In this opportunity I explain about number, more clear we see under this :

A. Kinds Of Numbers

1. Original number is positive integer

Example :

1, 2, 3, 4, 5, 6, . . . . . . . . .

2. Integer is number consisted of by positive integer, zero and number negative

. . . . . . ,-4, -3, -2, -1, 0, 1, 2, 3, 4, . . . . . .

3. Counting number is original number and zerol.

0, 1, 2, 3, 4, 5, 6, . . . . . . .

4. Prime number was original number which can only be divided with 1 and itself number.

Example :

2, 3, 5, 7, 11, 13, 17, 19, 23, . . . . . . . .

5. Rational number is number which can expressed as division of two integer, that is :

a/b ? an and b = integer, b ≠ 0

So rational number is integer, number that expressed with fraction or denary and its mixture.

6. Number irrasional is number which cannot expressed as division of two integers, or cannot expressed as :

a/b ? an and b = integer, b ≠ 0

Example :

Π = 3,14159 ..

2; 3, and so on

7. Real number ( R) is rational number aliance and number irrasional, or number which its(the unsure-unsur consisted of rational number and number irrasional.

R = { x|x = rational or x= irrasional }

8. Imaginary number is numbers marked by letter I from : infinite negativity until positive of clinegradasi".

9. Complex number is real number aliance with imaginary number.

Complex number usually is written down :

( a, b ) or a + bi

a is first tribe from a + bi called as real part.

b is second tribe from a + bi called as part which imaginary.

i called as imaginary unity.

Applies :

i2 = - 1

a + bi = 0 a = 0 and b = 0

a + bi = c + in ? a = c and b = d

Example of problem :

1. Determines number of from 6 odd original number that is first ?.

2. Determines many odd original numbers that is first the numbers 81 ?.

Reply :

1. Six odd original numbers that is first is 1, 3, 5, 7, 9, 11.

Hence nitrogen = 6

Number of from 6 first odd original number = n2

= 62

= 36

2. Number of odd original number nitrogens = n2 , hence :

n2 = 81

↔ n = 9 or n = - 9 ( doesn't fulfill)

So, many odd original numbers is 9.

Process explains friend number, to explain this number matter I assisted by my friend :

" Name : Fery Septianto

" Class : MAT NR 07

" NIM : 07305144041

" Place : My House

" Time : 14.00 wib

After I explain to Fery next to nothing its explanation internal issue, even in doing the problem of Fery can do during brief, nevertheless, still many the negatives.

Between of constraint experienced by :

" Explanation is using language english to find difficulties.

" Less can differentiate kinds of numbers.

" When in explaining a few are joking, because we seldom apply language english.

Mathematics as language

Where situation of all mathematics concepts, for example situation of number 1? Many the expert of mathematics, for example the expert of Model theory ( sees mathematics model) a also deepens philosophy at the opposite of mathematics concepts compromises that any mathematics concepts universally there is in mind every man.

So studied in mathematics is various symbols and expression to communicate it. For example Javanese verbally gives number symbol 3 by telling " Telu", while in Indonesian, the number is symbol [by] through utterance " Three". This is because his(its, many expert groups mathematics in group of language, or more generally in group ( equipment) communications, non science.

Specific structure investigated by mathematics frequently comes from natural sciences, and very common in physics, but mathematics also defines and investigates internal structure in itself mathematics, for example, theory generalizing to for some sub-field, or equipment assists for ordinary calculation. Finally, many area learning mathematicses done by them for because aesthetic only, sees hematics as a form of art than as applied or practical science.

Advanced mathematics is applied as a means of study various physical phenomenas yg complex, especially various nature phenomenons observed, that structure pattern, change, space and phenomenon characters can be come near or expressed in a form of formulation of systematic yg and full of various conventions, symbol and notation. Formulation result depicting my prila or the physical phenomena process usualy is called as mathematics model from phenomenon.

Language Use

The era of increasingly sophisticated only, at this time that many people use blogs to communicate, share ideas, his inspiration, and many things that we can use the blog. Here I will discuss the use of the English language on the blog. English is the international language, the language in the world of this blog will open a segment of readers from other countries. For the people of Indonesia, the English language into the second after the specter of mathematics that makes even the first ghost. So that we can 'go international' knowledge of the language is absolutely necessary, especially for bloggers who want to earn money from the blog world. Well, this just sharing how to set up any posts for the English-language blog.

A. However Dictionary is the absolute
Because of the limited vocabulary, the dictionary is something that is very helpful. Dictionaries can be a software and print. In addition to giving an explanation about the meaning of the word, the dictionary also gives the identification of the word noun (noun), work (verb), nature (adjective) and information (adverb). Knowledge of the matter is very important so that the error does not occur in the writing of the result will be difficult to understand the readers. Dictionary also includes the words idiom that is necessary untk known.

B. Always write a new word in a book
I prepare to write a book while reading an article in English. Books are used to record all the words that I know is not. With that record, I became very easy to find the words commonly used in an article and also make it easy to remember the meaning of words that are new.

C. Be careful with idioms
In the dictionary, idiom defined as sound or melody idiom. I interpret as a blend two or more words (phrase) that gives a different meaning from the original meaning of the word.

D. How safe is to use the Present Tense
Talk tenses will be many people who not like, I also own the less so. Of course, better knowledge about tenses into value-added for us. As a start, most secure way is to use and easy Present Tense. Tenses this most easily recognized as only the verb form first. For more information about the book tenses please open your English lessons.