ERCISES

Examine the following formal descriptions of sets so that you understand which members they contain. Write a short informal English description of each set.

a$.\{1,3,5,7,$dots$\}$

b$.\{dots,-4,-2,0,2,4,$dots$\}$

c$.$ for some $m$ in $N$

d$.$ for some $m$ in $N,$ and $n=3k$ for some $k$ in $N$

e$.$ is a string of os and $1$ s and $w$ equals the reverse of $w$

f$.$ is an integer and $n=n+1$