Valid names for symbols may be constructed using letters, digits, and
the apostrophe, and should not begin with a digit.
i1 : x
o1 = x
o1 : Symbol
i2 : q0r55
o2 = q0r55
o2 : Symbol
i3 : f'
o3 = f'
o3 : Symbol
Some symbols have preassigned meanings and values. For example, symbols
consisting of the letter o followed by a number are used
to store output values.
i4 : o2
o4 = q0r55
o4 : Symbol
Other symbols refer to functions built in to Macaulay 2 which provide
much of its functionality, as we will learn.
