Mathematical Notation in Notebooks

If you use the notebook front end for the Wolfram Language, then you can enter some of the operations discussed here in special ways.
Sum[f,{i,imin,imax}]
sum
Product[f,{i,imin,imax}]
product
Integrate[f,x]
indefinite integral
Integrate[f,{x,xmin,xmax}]
definite integral
D[f,x]
partial derivative
D[f,x,y]
multivariate partial derivative
Special and ordinary ways to enter mathematical operations in notebooks.
This is one of the standard palettes for entering mathematical operations. When you click a button in the palette, the form shown in the button is inserted into your notebook, with the black square replaced by whatever you had selected in the notebook.

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Esc sum Esc
summation sign
Esc prod Esc
product sign
Esc int Esc
integral sign
Esc dd Esc
special differential for use in integrals
Esc pd Esc
partial derivative
Ctrl+_ or Ctrl+-
move to the subscript position or lower limit of an integral
Ctrl+^ or Ctrl+6
move to the superscript position or upper limit of an integral
Ctrl + Shift + ,
move to the underscript position or lower limit of a sum or product
Ctrl+& or Ctrl+7
move to the overscript position or upper limit of a sum or product
Ctrl+% or Ctrl+5
switch between upper and lower positions
Ctrl + Space
return from upper or lower positions
Ways to enter special notations on a standard Englishlanguage keyboard.
You can enter an integral like this. Be sure to use the special differential entered as EscddEsc, not just an ordinary d:
Here is the actual key sequence you type to get the input:
When entering a sum, product or integral that has limits, you can create the first limit using the standard control sequences for subscripts, superscripts, underscripts, or overscripts. However, you must use Ctrl+% to create the second limit.
You can enter a sum like this:
Here is the actual key sequence you type to get the input: