And what s the difference? Greek letters in mathematics

It's the Greek alphabet.

But no. The lowercase is , and it doesn't matter to .

Lowercase ) was originally Danish.

Norway and other Northern Europe.

The name of the letter in the language is the same as its pronunciation, which is similar to the pronunciation of the o in English word. In 1939 the Bourbaki school introduced it into mathematics and used it to represent empty sets. Later, in order to distinguish between them, the empty set symbol was changed to the form of a circle and a slash.

In addition, the diameter symbol is , which is different from the letter and the empty set symbol. None of them have anything to do with the Greek alphabet. No matter how similar you think they are, they can't be pronounced as phi, the empty set symbol is read as "empty set", and the diameter symbol is read as "diameter".

The four characters in the above ** are: , where the third is used to represent the diameter. Their unicode encoding is: 0x03a6, 0x03c6, 0x03d5, 0x2205.

Strictly speaking, the writing of the lowercase letter "0x03c6) in the system Songti font library is wrong, and it is written as 0x03d5, and the writing in the above ** is correct. The "" 0x03d5) indicating the diameter is the old lowercase spelling, and the current lowercase is generally written as " "0x03c6). As for the empty set symbol, it has nothing to do with the other three symbols and should not be confused.

The Greek numerals are given below", the input method using the keyboard:

First, open the place where you need to enter Greek numerals, and click the cursor to locate here.

2. Then press the "Alt key" on the keyboard and don't let go (don't let go until the fourth step of the stupid sleepy tan).

3. After pressing the alt key, use the keypad area on the keyboard belt to enter the corresponding **.

Fourth, finally release the alt key that has been pressed to enter the corresponding symbol, and the Greek numerals are given below. “ⅰ41713、“ⅱ41714、“ⅲ41715。Ruler bucket.

There were 24 letters in ancient Greece, as follows:1. Alpha.

2. Beta.

3. Gamma.

4. δ Delta.

5. Epsilon code cover.

6. Intercept the tower.

7. ETA.

8. West Tower.

9. Jota.

10. Kapa.

11. Rabuda.

12, Miao.

13, New.

14, Kexi.

15. Omega Kerong stuffy source.

16, pie.

17. Meat.

18, Sigma.

19, peach.

20, Epsilon.

21, Buddha.

22, West.

23, Pousey.

24、ωomega

Meaning of letter referent:

Angle, coefficient delay, angular acceleration.

Magnetic flux coefficient, angle, coefficient.

Conductivity, angle, specific heat capacity ratio.

The amount of change, heating in chemical reactions, diopters, discriminants in one-dimensional quadratic equations.

Ohms, angular velocity, electrical angle of alternating current, mass fraction in chemistry.

Pi, (n) denotes the number of prime numbers not greater than n.

Mathematically handwriting:

Math, these symbols: Alpha, Beta, Gamma, δ Delta, Epsilon, Zeta, Ita, Sita, Jota, Capa, Lambda, Mio, New, Xey, Omiclon, Pie, Rou, Sigma, Tao, Jade Psilon, Ferai, Kay.

Origin of the Greek alphabet.

The Greek alphabet is derived from the Phoenician alphabet, which has only consonants and is written from right to left.

Because the writing instrument of the Greeks was a wax board, the previous line was written from the right stool to the left after the previous line was written, which became the so-called "ploughing" style of writing, and later gradually evolved into all left-to-right writing.

The direction of the letters is also reversed. The Romans introduced the Greek alphabet and slightly changed it to the Latin alphabet, which became popular all over the world. The Greek alphabet is widely used in academic fields such as mathematics. The Cyrillic alphabet is also an evolution of the Greek alphabet.