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Appendix to the top answer, if you are too lazy to read and only need the idea itself:
Will a ship that has had all its parts replaced over time still be the same ship?
The Ship of Theseus
According to an ancient Greek myth, the inhabitants of Athens for a long time kept the ship on which Theseus returned from the island of Crete. Over time, the ship began to rot, so it gradually began to change the boards. At a certain point, all the boards of the ship were replaced with new ones. As a result, a completely natural question arose: “Is this still the same ship or is it already completely different?” In addition, there was another question: “What if you build another such ship from old boards, then which one will be real?”
In the modern interpretation, this paradox sounds like this: “If you gradually replace all the components in the original object, will it remain the same object?”
The answer may be: any object can be “the same” both quantitatively and qualitatively. This means that after changing the boards, the ship of Theseus will be quantitatively the same ship, but qualitatively-already different
Theseus ' Paradox – will the object (in this case, the ship)remain the same if you replace all its components in it?
“Same” means quantitatively and / or qualitatively. So after changing the board, Theseus ' ship will be quantitatively the same, but qualitatively a different ship.
The wording of the paradox has already been described above. With the invention of bureaucracy, the paradox is no longer so terrible – if a ship is registered in the registration authority according to documents, then the ship is the same, even if it sank a long time ago. On the other hand, new bureaucratic paradoxes are being added. The documents were changed, although the ship was not touched – is the ship the same or not? Documents were lost or underformed – is there a ship or not?..
Theseus is known in Greek mythology as the conqueror of the Minotaur. The Athenians long preserved the ship on which Theseus returned. But it fell into disrepair. They replaced it and repaired it, replacing the old rotten boards with new ones. �
This ship became the subject of a philosophical dispute: some believed that despite the fact that the ship was completely updated, however, it remained the same. Others thought that the ship was completely new. These philosophical disputes have been called the Theseus Paradox. The dispute continues to this day. This is similar to the Fisofs ' unresolved question of what came first – the egg or the chicken.�
Plutarch asked in connection with Theseus ' parodoxus: Which one are you? The person you are today? The person you were five years ago? The man who will be here in fifty years? When I “am” myself? This week? Today? This hour? Right now? What is your Self? Are you a physical body? Or are you just your thoughts and feelings? You are your actions?�
Further – more. Trying to come up with an unambiguous answer, Heraclitus put forward the idea that you can not enter the same river twice. Plutarch disputed this claim.�
Centuries later, the philosopher Thomas Hobbes added a new question to this philosophical conundrum: “What would happen if the original planks were assembled after they were replaced and used to build another ship?”