It is from this point of view that I wish to speak here about time. Before starting to discuss time, let it be noted that all features of the universe are not time dependent. The world pf pure ideas and in particular that of mathematical concepts is eternal. Mathematics is a difficult subject, studied by mathematicians, who have great difficulties understanding it. This means that mathematics also belongs to a real world of Platonic ideas, not easily grasped by human beings, which is not that in which we experience the physical world.
Worlds can therefore exist outside time.
The first way to consider time, ia as a kind of space. It is then a fourth dimension. This conception of time is suitable for predictable phenomena . If the directions of all motions are reversed the past will be repeated in the future. Quantum mechanics also has such a deterministic timeless character, as long as there is no wave function collapse .