Question: Exercise 9 ( Ex . 4 4 , Chapter 1 of [ Martin; 2 0 1 1 ] ) . Each case below gives a

Exercise 9(Ex.44, Chapter 1 of [Martin; 2011]).
Each case below gives a recursive definition of a subset L of {a, b}
*
. Give a simple non-recursive
definition of L in each case.
a. a in L; for any x in L, xa and xb are in L.
b. a in L; for any x in L, bx and xb are in L.
c. a in L; for any x in L, ax and xb are in L.
d. a in L; for any x in L, xb, xa, and bx are in L.
e. a in L; for any x in L, xb, ax, and bx are in L.
f. a in L; for any x in L, xb and xba are in L.

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