In (Built-in Mathematica Symbol)

In[n] is a global object that is assigned to have a delayed value of the n\[Null]^th input line.

Repeated Patterns (Mathematica Tutorial)

Repeated patterns. Multiple blanks such as x__ allow you to give patterns in which sequences of arbitrary expressions can occur. The Mathematica pattern repetition operators ...

Typing Vectors (Mathematica Tutorial)

Type a left parenthesis and a right parenthesis, then move the insertion point to be between them. Type (), and press ←. Type the first entry of the vector. Create the next ...

Combining Lists (Mathematica Tutorial)

Functions for combining lists. Join concatenates any number of lists together. Union combines lists, keeping only distinct elements.

Moving through Expressions (Mathematica Tutorial)

You can use the keyboard to move the cursor forward or backward one character or one word at a time. You can also delete the character or word to the right or the left of the ...

Typing Matrices (Mathematica Tutorial)

Choose Insert > Table/Matrix > New. Use the dialog box that pops up to create a matrix. Suppose the entry in the top-left position is selected.

File Menu (Mathematica Guide)

Systems Interfaces and Deployment How ... (Mathematica Overview)

Connect to Other Systems Get Help in Mathematica

ExtentMarkers (Built-in Mathematica Symbol)

ExtentMarkers is an option to DiscretePlot and DiscretePlot3D that specifies markers to draw at extent boundaries.

Insert > Table/Matrix > Make Spanning (Mathematica Menu Item)

Make Spanning combines the selected entries from a formatted grid into a single spanning entry.