This symbol ∑ often appears in physical formulas. It has several meanings. What are they?

This symbol ∑ often appears in physical formulas. It has several meanings. What are they?

Open classification: mathematics, mathematical symbols, Greek alphabet
Sigma, sigma, the Greek letter (read: sigma) means "sum" in mathematics, such as:
Σ PI, I is 1,2,..., t,
That is to find the sum of P1 + P2 +... + Pt
Sigma (capital sigma, lowercase sigma) is the eighteenth Greek letter. In Greek, if the last letter of a single word is lowercase sigma, it should be written as & # 962;, which is also called final sigma（ Unicode:U+03C2 ）In modern Greece, the number stands for 6
Capital Sigma is used for:
Sum sign in Mathematics
Lowercase σ is used for:
Statistical standard deviation
The Cyrillic C and Latin s are both evolved from sigma

What is the symbol of average velocity? What is the formula of average velocity in physics?

V denotes
v=s/t

What letter is the length of the sum of edge lengths?
Attention! Area: s volume: V length:?

L

The radius length is () of the diameter and is denoted by ()

1/2 、r=1/2 d

How many scientific knowledge or symbols are there in the logo of CCTV-10

Closed circuit television
China Central Television

What is the physical quantity of current

Electric current is a physical quantity that represents the amount of charge flowing through a certain section of an object in unit time

Fill in the blanks:
The main symbols of resistance, capacitance and inductance are

RCL

What does the nswe letter mean in the map?

Representative direction:
E stands for East;
W stands for West;
S stands for South;
N stands for North;
And the word of news is news, because news comes from all over the world

S for the south, n for the north, and what are the letters for East and West?

West w East e

The meaning of the letters on the map
Let me check the map of Jiangyin City in Jiangsu Province. There are many letters on it. For example, G and s represent national highway and provincial highway respectively. What about x? What is x302?

County highway, 3 head is slant East, slant west direction