Create Inactive Symbols and Expressions 

The new function Inactivate can prevent all, or only certain, operations from executing. Symbolic processing can continue unimpeded, and the partner function Activate will enable allor only certaininactivated operations.

Inactivate everything.

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Only inactivate addition.

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Activate what was previously inactivated.

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Inactivate an expression manually by wrapping it in Inactive.

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Different pieces can be activated separately.

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