I found a paper that might be of interest to those interested in 
Tegmark's work.


I discuss some problems related to extreme mathematical realism, 
focusing on a recently proposed "shut-up-and-calculate" approach to 
physics (arXiv:0704.0646 <http://arxiv.org/abs/0704.0646>, 
arXiv:0709.4024 <http://arxiv.org/abs/0709.4024>). I offer arguments for 
a moderate alternative, the essence of which lies in the acceptance that 
mathematics is (at least in part) a human construction, and discuss 
concrete consequences of this--at first sight purely 
philosophical--difference in point of view.


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