{}

set

681

?

is an element of

681

?

is not an element of

681

?

subset

681

?

proper subset

681

?

union

681

?

intersection

681

empty set

681

A\ B or A - B

difference set of set A by set B

681

A B

Cartesian product of A and B

681

1 _A

the identity map or function on the set A

683

? _ij

Kronecker delta: = 1 if i = j; = 0 if i ? j

?

implies

?

if and only if

?

the end of a proof or a solution

Sec.2.7.1(etc.)

the section numbered 7.1 in Chapter 2

Sec.A.1(etc)

the section numbered 1 in Appendix A

Sec.B.2(etc.)

the section numbered 2 in Appendix B

Fig. 1.5(etc.)

the figure numbered 5 in Chapter 1

[1] (etc.)

Reference [1]

Ex.1 of Sec.2.3 (etc.)

problem 1 in Exercises of Sec.2.3

Ex. or or or

Exercises or or or

A = [ a _ij] _{m n}, [ a _ij] or A _{m n}

matrix of order m n : m rows, n columns, where 1 ? i ? m and 1 ? j ? n

700

A = [ a _ij] _{n n} or A _{n n}

square...