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Dear Li Perry,

currently, in a Math part, you cannot use a subset knowledge, which can only be used for Text.

In a Math part, if you want to restrain the number of characters/symbols that can be recognized, the solution consists in creating you own grammar resource. The easier is that you use the existing grammar definitions, keep the symbols and patterns you want to recognize.

Then, you compile the grammar using the online tools and add it in your math.conf file:

-E.g., you can create mycustomGrammar.def

-You drop the .def file: https://developer.myscript.com/support/recognition-assets/#resource-builder

-You download the compiled resource, resp. mycustomGrammar.res

-You add it in the assets of your project (e.g. assets/resources/math/)

-You create a new configuration in the math.conf file:

Bundle-Version: 1.0
Bundle-Name: math
Configuration-Script:
 AddResDir ../resources

Name: standard
Type: Math
Configuration-Script:
 AddResource math/math-ak.res
 AddResource math/math-grm-standard.res

Name: myConf
Type: Math
Configuration-Script:
 AddResource math/math-ak.res
 AddResource math/mycustomGrammar.res

-You then set your configuration: conf.setString("math.configuration.name", "myConf");

When starting your applicatipn, you will now set you own grammar, with the symbols and patterns you want to recognize.

Let us know if you have any question.

Best regards,

Olivier

NB: please find the math-grm-standard.def as an attachment, which you can then tune according to your needs