Terminology and Notation
Though we use relatively standard mathematical terminology and notation in this book, our practices may depart in a few details from those of some readers.
Set Theory
We use the standard symbols 
for the set of all natural numbers, 
for the set of all integer numbers, 
for the set of all rational numbers, 
for the set of all real numbers, and 
for the set of all complex numbers.
We write 
for the number of elements in the set 
: if 
is a finite set, 
in an integer; if 
is ...
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