[code]a:=1/2 --- 変数の宣言[br][/code][code]Delete[a] --- 変数の削除[br][/code][br]x+y=1 --- 方程式の宣言[br]LeftSide[x+y=1] -> x+y --- 左辺[br]RightSide[x+y=1] -> 1 --- 右辺[br][br][code]#[/code] --- 静的直前参照[br][code]#2[/code] --- 静的履歴参照[br][code]$[/code] --- 動的直前参照[br][code]$2[/code] --- 動的履歴参照