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++-----------------------------------------------------------------------------+
+| plaintexmathon |
++-----------------------------------------------------------------------------+
+
+Abbreviation: ã|noneã%
+
+Parameters: ã|noneã%
+
+ ã|Description:ã%
+This markup can be used to make the dollar sign ($) the valid math mode
+indicator as is used in PLAIN TEX instead of the TEXT1 math mode indicator,
+the at sign (@).
+
+ ã|Example:ã%
+
+\plaintexmathon
+$x+y=100$
+
+ ã|Notes:ã%
+
+Do not use this markup with \monospace.
+ If used, it should be specified at the top of your document. You will
+need to use the TEX \catcode markup to change back to using the at sign as
+the math mode indicator:
+
+\catcode'44=12
+
+For more on the \catcode markup, refer to The TEXbook.