Can't use undefined, so need to set alternative value to a low value
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Expression 13: . "h" left parenthesis, "x" , "y" , right parenthesis equals left brace, "x" plus "y" less than min left parenthesis, "X" Subscript, "m" "i" "n" , Baseline plus "W" , "Y" Subscript, "m" "i" "n" , Baseline plus "L" , right parenthesis : "x" plus "y" , "X" Subscript, "m" "i" "n" , Baseline plus "Y" Subscript, "m" "i" "n" , Baseline minus 100 , right brace.hx,y=x+y<minXmin+W,Ymin+L:x+y,Xmin+Ymin−100
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Expression 14: . "h" left parenthesis, "x" , "y" , right parenthesis equals "x" minus StartFraction, "y" Over 2 , EndFraction.hx,y=x−y2
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Expression 15: . "h" left parenthesis, "x" , "y" , right parenthesis equals StartFraction, "x" plus 1 Over "W" plus "X" Subscript, "m" "i" "n" , Baseline minus "y" , EndFraction.hx,y=x+1W+Xmin−y
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Expression 16: . "h" left parenthesis, "x" , "y" , right parenthesis equals sine left parenthesis, StartFraction, pi Over 2 , EndFraction "x" , right parenthesis plus sine left parenthesis, StartFraction, pi Over 2 , EndFraction "y" , right parenthesis.hx,y=sinπ2x+sinπ2y
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Two mountains and a river?
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Expression 18: . "h" left parenthesis, "x" , "y" , right parenthesis equals 5exponent left parenthesis, negative StartFraction, left parenthesis, left parenthesis, "x" minus 5 , right parenthesis squared plus left parenthesis, "y" minus 6 , right parenthesis squared , right parenthesis Over 3 , EndFraction , right parenthesis plus 8exponent left parenthesis, negative StartFraction, left parenthesis, left parenthesis, "x" minus 6 , right parenthesis squared plus left parenthesis, "y" minus 2 , right parenthesis squared , right parenthesis Over 3 , EndFraction , right parenthesis minus 3exponent left parenthesis, negative StartFraction, left parenthesis, "x" minus 2 , right parenthesis squared Over 3 , EndFraction minus 0.1sin left parenthesis, "y" , right parenthesis , right parenthesis.hx,y=5exp−x−52+y−623+8exp−x−62+y−223−3exp−x−223−0.1siny