thank you for the opportunity to comment. I enjoy your comments and column very much.

Elizabeth ]]>

I believe an model is suppose to be an interpretation of a formal theory. So, for a complete cosmological formal theory T, Every theorm derivable in T has an interpretation, descriabled by a model M.

If we can consider all the possible ways things could be, or all the possible intrepretation for T, then this forms an essemble of models E. Each derivable statements in T correspondes to some elements in E.

So, for a practical example. I can think of a cosmological theory T as being this TOE. T would be either a single equation or multiple equations. In both case, there would be constants & initial conditions. One can imagine varying the constants, parameters in T to form a multiverse.

If What i am saying make sense, then for a theory T, there is more than 1 model, and if we can consider a set of models as forming an multiverse, then multiverse is implied for every cosmological theory.

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