.xodarap laropmet ro xodarap ycnetsisnoc a sa nwonk osla si xodarap rehtafdnarg ehT
:selpmaxe rehtO
.neppah ot tnaem si tahw od ylno nac relevart emit a gninaem ,noitcidartnoc a setaerc taht yaw a ni deretla eb tonnac tsap eht erehw krowemarf a nihtiw ylno tub ,elbissop eb thgim levart emit taht tseggus ,elpicnirp ycnetsisnoc-fles vokivoN eht ekil ,seiroeht emoS
:snoituloseR elbissoP
.)htaed s’rehtafdnarg eht( noitanimile nwo sti fo esuac eht eb ot smees )ecnetsixe s’relevart emit eht( tceffe na erehw ,ytilasuac htiw eussi laitnetop a sthgilhgih xodarap rehtafdnarg ehT
:ytilasuaC
.ecalp tsrif eht ni rehtafdnarg rieht llik ot emit ni kcab delevart evah t’ndluoc yeht ,detsixe reven nosrep eht fI
:xodaraP ehT
.nrob eb reven dluow )sevlesmeht nosrep eht ,erofereht dna( tnerap s’nosrep eht ,dellik si rehtafdnarg eht fI
:noitcidartnoC ehT
.nerdlihc yna sah eh erofeb rehtafdnarg rieht sllik dna emit ni kcab slevart enoemos enigamI
:oiranecS ehT
:nwodkaerb a s’ereH
.flesti tneve levart emit eht fo ytilibissop eht dna htrib nwo rieht gnitneverp suht ,rotsecna nwo rieht gnillik dna emit ni kcab gnilevart nosrep a fo noitcidartnoc laitnetop eht serolpxe taht levart emit ni tnemirepxe thguoht a si xodarap rehtafdnarg ehT
The grandfather paradox is a thought experiment in time travel that explores the potential contradiction of a person traveling back in time and killing their own ancestor, thus preventing their own birth and the possibility of the time travel event itself.
Here’s a breakdown:
The Scenario:
Imagine someone travels back in time and kills their grandfather before he has any children.
The Contradiction:
If the grandfather is killed, the person’s parent (and therefore, the person themselves) would never be born.
The Paradox:
If the person never existed, they couldn’t have traveled back in time to kill their grandfather in the first place.
Causality:
The grandfather paradox highlights a potential issue with causality, where an effect (the time traveler’s existence) seems to be the cause of its own elimination (the grandfather’s death).
Possible Resolutions:
Some theories, like the Novikov self-consistency principle, suggest that time travel might be possible, but only within a framework where the past cannot be altered in a way that creates a contradiction, meaning a time traveler can only do what is meant to happen.
Other examples:
The grandfather paradox is also known as a consistency paradox or temporal paradox.
-Tenet 2020.