ExcludedForms

is an option that gives a list of patterns for expressions that should be excluded from an operation performed by a particular function.

Details

Different functions use different default settings for ExcludedForms.
In functions such as Simplify and FullSimplify, ExcludedForms specifies classes of expressions that should not be touched if they are encountered at intermediate stages in a computation.
In functions such as TakeLargest and TakeSmallest, ExcludedForms specifies classes of expressions that should be considered in selecting elements to return.

Examples

This gives no simplification:

Wolfram Language code: Simplify[(x - 1)(x + 1)(x ^ 2 + 1)(x - 2) ^ 10]

Excluding transformations of (x-2)^10 allows you to expand the remaining terms:

Wolfram Language code: Simplify[(x - 1)(x + 1)(x ^ 2 + 1)(x - 2) ^ 10, ExcludedForms -> {(_Plus) ^ _}]

This gives a result in terms of Arg[x]:

Wolfram Language code: FullSimplify[Im[Log[x] + 2 x - 3y] - 2Im[x]]

This specifies that Log[x] should not be transformed:

Wolfram Language code: FullSimplify[Im[Log[x] + 2 x - 3y] - 2Im[x], ExcludedForms -> {Log[_]}]

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