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).
      


OperationOperatorExampleWritingNotes
sum+ 2 + 3 2+3
subtraction- 5 1 5-1
multiplication* 4 x 4*x Multiplication operator must be always written, although it is not displayed.
multiplication#* 4 5 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 8:4 in the same line
division/ 8 4 8/4 in the fractions
divisionfraction(,) 5 + 3 3 + 1 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 2^3
round brackets() 2 + 3 (2+3)
square brackets[] 2 + 3 + 5 [(2+3)+5]
curly brackets{} 1 + 2 + 3 + 4 {1+[2+(3+4)]}
equal= x 2 3 x + 1 = x 2 + x 2 x^2-3*x+1 = -x^2+x-2
plus/minus#+- 2 #+- 2
infinity#oo #+- #oo
uppercase delta #Delta
uppercase sigma #Sigma
lowercase sigma #sigma
dots ... #...
square rootsqrt() 3 sqrt(3)
absolute valueabsolute() x 2 1 absolute(x^2-1)
summationsummation() x i M 2 summation((x_i-M)^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 writingComputer writing to use in this site
1 2 1/2
2 x 2#*x
2 x 2*x
2 x y 2*x*y
x 2 x^2
2 x y 3 2*x*y^3
2 + 3 5 4 + 1 2 x 2 2 3 2+(3-5)#*4+[1/2*x^2]^2/3
x 1 x + 1 (x-1)*(x+1)
x 2 5 x + 6 x^2-5*x+6
x 2 5 x + 6 4 x 2 9 fraction(x^2-5*x+6,4*x^2-9)


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