Writing Mathematics with the computer

Usual mathematical writing is hard to implement at the computer.
There are interfaces that allow you to achieve the writing complexity,
but they are not easy to use for novice users.
Moreover, in many professional softwares they are not available because such interfaces are considered more a hindrance than a help.
So it is convenient to learn how to write mathematical expressions on one line.
Read the instructions below and try to write an expression (insert an expression that makes sense, if you want an outcome that makes sense).



Operation  Operator  Example  Writing  Notes 
sum  + 
 2+3  
subtraction   
 51  
multiplication  * 
 4*x 
Multiplication operator must be always written, although it is not displayed. 
multiplication  #* 
 4#*5 
To display the multiplication operator as a dot. Note that in the normal calculus software it is always used * to denote multiplication. 
division  : 
 8:4 
in the same line 
division  / 
 8/4 
in the fractions 
division  fraction(,) 
 fraction(5+3,3+1) 
To use with two expressions division. Between bracket you write the numerator, then the denominator, divided by a comma: fraction(numerator,denominator) 
power  ^ 
 2^3  
round brackets  () 
 (2+3)  
square brackets  [] 
 [(2+3)+5]  
curly brackets  {} 
 {1+[2+(3+4)]}  
equal  = 
 x^23*x+1 = x^2+x2  
plus/minus  #+ 
 #+ 2  
infinity  #oo 
 #+ #oo  
uppercase delta  
 #Delta  
uppercase sigma  
 #Sigma  
lowercase sigma  
 #sigma  
dots  
 #...  
square root  sqrt() 
 sqrt(3)  
absolute value  absolute() 
 absolute(x^21)  
summation  summation() 
 summation((x_iM)^2)  

Actually the round brackets are the only brackets used in the calculus softwares, and they replace the square brackets and the curly brackets (which actually are only a hint to help the student to understand the structure of an expression).
Let's see some examples of expressions and how you should write them.

Mathematical writing  Computer writing to use in this site 
 1/2 
 2#*x 
 2*x 
 2*x*y 
 x^2 
 2*x*y^3 
 2+(35)#*4+[1/2*x^2]^2/3 
 (x1)*(x+1) 
 x^25*x+6 
 fraction(x^25*x+6,4*x^29) 

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