"Made of math" means more or less I think "metric" in the sense of topologies. So fudamentally, the simplest universe you could think of would be in a set of r

"Made of math" means more or less I think "metric" in the sense of topologies. So fudamentally, the simplest universe you could think of would be in a set of related topologies without defined metrics. Then going up from there you get into more complex metrics, like say, Einstein's Reimann metric, and the like. Perhaps our world has a metric of 26 dimensions like in string theory. Anyway, as near as I can tell, Tegmark's "made of math" idea effectively means all topologies and metrics exist eternally, we happen to live on one of these metrics, or more precisely, upon one of the metrics in which self-aware substructures like us could exist. Anyway, makes as much sense to me for a theory of everything, as for example, positing the "Intelligent Design by the Flying Sphaghetti Monster" being shoved down the throats of children these days!! :-)