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It could not travel because there was no place to go; the universe did not exist.

What if the point of singularity was traveling at the speed of light

Without time you can only have a steady/stable state because you need time for the state to change.

QuoteWithout time you can only have a steady/stable state because you need time for the state to change.Here's another example of someone treating time as a necessarily different class of dimension.I don't think there need be such an essential difference. A graph of x against y can be the same shape as a graph of x against t. Differentiable and continuous functions can occur between any two variables. (At least in pure Maths)Even the requirement, in our experience, that t can only increase, could be merely a local constraint. (Some of) the extra dimensions which are invoked in String Theory could also follow the 'monotonic' rule which time follows here/now.

Can someone explain monotonicity in idiot language, please []

causality is an operational concept based on the idea of a necessary and sufficient condition. It's an empirical concept, not a mathematical or logical one.

Quote from: DoctorBeaver on 09/11/2008 22:55:38Can someone explain monotonicity in idiot language, please []Sorry - "only goes one way". Increases or decreases.

So is the suggestion that there could be spatial dimensions that only allow movement in 1 direction?

If we think of the increase of entropy as time increases as a given, that implies that, as time increases, entropy increases. A graph would have a positive slope. Plotted in reverse, it would mean a negative slope.The thing about graphs involving time is that we only see one value of x for any value of t. Unlike xy graphs which can have loops.

If we think of the increase of entropy as time increases as a given, that implies that, as time increases, entropy increases. A graph would have a positive slope. Plotted in reverse, it would mean a negative slope.

Our 'existence in time' must be far from a point. We are 2m in height, which represents a spread of 6ns around our 'centre'. This is because 'we' are all of our body. Even if you say 'we' are in our brain, the timewidth is a bit under 1ns. Where 'is' our consciousness?I agree that there may be a quantum size which is associated with time but, in the same way that energy quanta vary in value, time quantum values could also depend on something else.

And - re your moving back in time comment: would you also have to retrace your steps in every respect, i.e. would all your atoms have to move and behave generally in precisely the inverse way?

Are we just talking bollocks here?