This is a 2-D math parser error caused by an incorrectly formed inequality.  One way in which users encounter this error is when they intended to use a Maple prompt (>).  The prompt is not entered using the greater than key.

To insert an input region, do one of the following:

Example

$\>\sin \left(x\right)$

In this case, an expression was entered after an angle bracket as an attempt to use a Maple prompt (which always displays in red) within Document mode.  You must use the proper method to insert a Maple prompt.

Solution:

To insert a Maple prompt, do one of the following:

You can then enter your expression and press Enter to execute.

Example

In this example, the expression given as the first argument cannot be parsed.

Solution 1:

Change the expression to $a\=b \mathbf{or} a\>b$.

Solution 2:

Use the greater than or equal to symbol, which can be entered as >= or from the palettes.

Document Mode vs Worksheet Mode, Insert Menu, boolean, type/relation