math 3 13

xn ym xy partialdiffdegree list nm plus nm lambda x y sin times xy x y a diva E divE E x y z xy xz zy div ( x x+y y x+z z z+y ) f gradf f x y z xyz grad ( xyz xyz ) a curla ×a E 2 E x y z fxy 2 ( xyz f xy ) abc {a,b,c} x x5 x { x | x<5 } S ST S { S | ST } x x5 x x { x | (x<5) xN } { abc (a,b,c) x x5 ( x | x<5 ) AB AB S L S LS A B AB S L S LS aA aA aA aA A B AB A B AB A B AB A B AB A B AB A 5 |A| = 5 AB A×B