Max Tegmark is an American cosmologist who wrote ‘The Mathematical Universe’.

Quotes by Max Tegmark in Time One

The rate of time flow perceived by an observer in the simulated universe is completely independent of the rate at which the computer runs the simulation...

There exists an external physical reality completely independent of us humans.

Our external physical reality is a mathematical structure.

[T]he true mathematical structure isomorphic to our world, if it exists, has not yet been found.

[O]ur universe is mathematics in a well-defined sense.

[Proof of extra dimensions] would alter our whole notion of what reality is.