Is (theoretical) timetravel possible without automatically creating a paradox?

[T.G. Oskar]

There is no "timeline" in my opinion. The only real thing is what is "now".
Time is not something that can have a "speed".
Things happen at a certain speed, because of the combination of several factors which have their own speed.

Time is simply a term made up by man to make it easier for us to discuss the fact that some things were different at a different (umm...) time
There is no river on which every moment still exists and we are on this moment by coincidence.

Hence, you consider time as a measurement. Why are you asking if you could travel through time, if you already know it's impossible?

Or, if you point out that it were possible to travel through time, why aren't you using the easiest method to explain time travel? As a river that flows, which can change courses, which can be affected by ripples done by the actions of men. It's an allegory.

Of course, had you noticed my post, you'd have noticed the grim truth.