If names lack Fregean senses, co-referring names like 'Hesperus' and 'Phosphorus' yield identical Fregean and Russellian propositions, collapsing the alleged fine-grainedness asymmetry.
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The meaning or idea associated with a word or name, distinct from what the word actually points to—for example, 'the morning star' and 'the evening star' have different senses but refer to the same object (Venus).
Gottlob Frege(historical philosopher)
A late 19th and early 20th-century German philosopher and logician who made fundamental contributions to understanding how language and meaning work.
Hesperus and Phosphorus(as a historical philosophical reference)
Two ancient names for the same celestial object (the planet Venus), used as a famous philosophical example because people didn't realize they referred to the same thing.
Russellian proposition(Philosophy of language; contrasted with Fregean propositions and intensions)
A propositional content that corresponds many-one to intensions
asymmetry(Modal logic frame semantics)
A frame property expressible in hybrid logic by the formula c→□¬◇c, meaning if world x accesses world y, then y does not access x.