m.a. wrote:
> *Bruno,*
> *           I've encountered some difficulty with the examples below. 
> You say that  "in extension" describes  exhaustion or 
> quasi-exhaustion. And you give the example:  "**B = {3, 6, 9, 12, ... 
> 99}".*
> *           Then you define "in intension" with exactly the same type 
> of set: "Example: Let A be the set {2, 4, 6, 8, 10, ... 100}".*

No, that's not the intensional definition.  This "We can easily define A 
in intension:  A = the set of numbers which are even and more little 
than 100." is the intensional definition.


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