This error occurred because the expression is not complete.
Example 2 - Error appears for math in a paragraph or formula
This error occurred because the expression is not valid Maple syntax.
Solution 1: Change the expression to nonexecutable math: click the expression, and use the shortcut key Shift + F5. The error message is removed. For more information, see Executable and Nonexecutable Math.
Use the ⊥ symbol to indicate that two lines are perpendicular.
Solution 2: Select the expression, then from the Format menu select Convert To>Atomic Variable. This turns the expression from a mathematical object to a single name. Maple no longer tries to parse the expression. Now, when it is executed there is no parse error.
Use the symbol to indicate that two lines are perpendicular.