Expression 1: "s" Subscript, "p" "h" "e" "r" "e" , Baseline left parenthesis, "u" , "v" , right parenthesis equals left parenthesis, sin left parenthesis, pi "v" , right parenthesis cos left parenthesis, 2 pi "u" , right parenthesis , sin left parenthesis, pi "v" , right parenthesis sin left parenthesis, 2 pi "u" , right parenthesis , cos left parenthesis, pi "v" , right parenthesis , right parenthesissphereu,v=sinπvcos2πu,sinπvsin2πu,cosπv
1
Expression 2: "s" Subscript, "p" "h" "e" "r" "e" , Baseline left parenthesis, "u" , "v" , right parenthesis left brace, left parenthesis, 1 , 1 , 1 , right parenthesis times left parenthesis, "x" , "y" , "z" , right parenthesis less than or equal to 0 , right bracesphereu,v1,1,1·x,y,z≤0
