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Not all rigid expressions are directly referential; there are descriptions that are rigid de facto.
However, in a language that treats non rigid expressions as genuine terms, it turns out that neither the classical nor the free logic rules for the quantifiers are acceptable.
Use these rigid expressions at your peril.
It could be anything between 40 and 80; her face is a rigid surgical mask: any expression not sliced away by the scalpel has been frozen with Botox.
Kripke (1980) calls an expression a rigid designator if it refers to the same object in every possible world.
An expression is a rigid designator if its denotation is constant across possible worlds.
Since the quadrotor UAV can be considered as a rigid body aircraft, the analytic closed-form expressions of a rigid body's attitude kinematics are derived from differential of exponential on SO(3).
It arises when non-rigid expressions such as 'the inventor of bifocals' are introduced to the language.
A decade ago, fashion was a rigid system.
Such a claim requires an argument to show that 'H2O' is a rigid designator, since it is not a directly referring expression.
We propose that a rigid β7- β8 turn is critical for efficient receptor expression and function.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com