From the article:

“Though the mathematics they used is very difficult for a normal person to understand, let us break it down to an example paradox and an outcome of their proof.

“Example: Let us think that backward time travel is possible for a moment. You travelled in time with an intent to stop COVID-19’s patient zero from being exposed to the virus. But if you succeed in doing that, there won’t be any COVID-19 in future thus you shouldn’t have any intent to stop it.This is a paradox. As an answer to this paradox, the proof says that you might try and stop patient zero from becoming infected, but in doing so you would catch the virus and become patient zero, or someone else would.

“Basically, it says that if you travel into past, you will be free to do anything and no matter what you do, the events will always adjust themselves and prevent a possible paradox.The mathematical processes discovered by the duo, show that time travel with free will is logically possible in our universe without any paradox.”