Expression 9: "x" equals "b" left brace, 0 less than or equal to "y" less than or equal to "f" left parenthesis, "b" , right parenthesis , right bracex=b0≤y≤fb
9
Expression 10: "x" equals "b" left brace, 0 greater than or equal to "y" greater than or equal to "f" left parenthesis, "b" , right parenthesis , right bracex=b0≥y≥fb
10
Expression 11: "y" equals 0 left brace, "a" less than or equal to "x" less than or equal to "b" , right bracey=0a≤x≤b
11
Expression 12: "y" equals 0 left brace, "b" less than or equal to "x" less than or equal to "a" , right bracey=0b≤x≤a
12
Expression 13: "x" equals "a" left brace, 0 less than or equal to "y" less than or equal to "f" left parenthesis, "a" , right parenthesis , right bracex=a0≤y≤fa
13
Expression 14: "x" equals "a" left brace, 0 greater than or equal to "y" greater than or equal to "f" left parenthesis, "a" , right parenthesis , right bracex=a0≥y≥fa