HP 48gII hp 48gII_user's manual_English_E_HDPMSG48E67_V2.pdf - Page 77

down arrow key (˜) in any location, repeatedly, to trigger the clear editing cursor. In this mode, use the left or right arrow keys (š™) to move from term to term in an expression. When you reach a point that you need to edit, use the delete key (ƒ) to trigger the insertion cursor and proceed with the edition of the expression. Creating algebraic expressions An algebraic expression is very similar to an arithmetic expression, except that English and Greek letters may be included. The process of creating an algebraic expression, therefore, follows the same idea as that of creating an arithmetic expression, except that use of the alphabetic keyboard is included. To illustrate the use of the Equation Writer to enter an algebraic equation we will use the following example. Suppose that we want to enter the expression: 2 3 λ + e −µ ⋅ LN   x + 2µ ⋅ θ 1/3 ∆y   Use the following keystrokes: 2 / R3 n m x + 2 * ~,m * ~,c ~„y --- / ~,t Q1/3 This results in the output: In this example we used several lower-case English letters, e.g., x (~„x), several Greek letters, e.g., λ (~,n), and even a combination of Greek and English letters, namely, ∆y (~,c ~„y). Keep in mind that to enter a lower-case English letter, you need to use the combination: ~„ followed by the letter you want to enter. Also, you can always copy special characters by using the CHARS menu (...±) if you don't want to memorize the keystroke combination that produces it. A listing of commonly used ~,keystroke combinations was listed in an earlier section. Page 2-19