[FOM] RE: FOM Digest, Vol 5, Issue 15

[Matt Insall]

Lerma: 
In the realm of Mathematics there are no cabbages, nor apples, nor bricks, 
nor planets, nor anything "material" at all. 

...  

But in Mathematics there are not "things" to start with.


Insall: 
On the other hand, there can be ``things'' `to start with'.  


Lerma:  
The real problem of Foundations is how to build the entire 
building of Mathematics without any material bricks at all.  


Insall:  
I would have said ``... with or without any material bricks 
at all.''  Why should we not include as ``foundational'' set 
theories with urelements (``things''), for example?