Sujet : Re: Replacement of Cardinality (ubiquitous ordinals)
De : james.g.burns (at) *nospam* att.net (Jim Burns)
Groupes : sci.logic sci.mathDate : 04. Aug 2024, 04:45:58
Autres entêtes
Organisation : A noiseless patient Spider
Message-ID : <75fe3de0-9922-4a6e-8a4a-1df25bbc5cbc@att.net>
References : 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21
User-Agent : Mozilla Thunderbird
On 8/3/2024 9:08 PM, Ross Finlayson wrote:
On 08/03/2024 12:08 PM, Jim Burns wrote:
On 8/2/2024 3:55 PM, Ross Finlayson wrote:
On 08/02/2024 03:39 AM, FromTheRafters wrote:
Then what *is* restricted comprehension?
>
Usually it's just the antonym of
expansion of comprehension.
What I ask,
if that you surpass,
the inductive impasse,
of the infinite super-task.
I am more familiar with unrestricted comprehension
being the antonym of restricted comprehension.
>
Unrestricted comprehension grants that
{x:P(x)} exists because
description P(x) of its elements exists.
>
Restricted comprehension grants that
{x∈A:P(x)} exists because
description P(x) and set A exist.
>
The existence of set A might have been granted
because of Restricted.Comprehension or Infinity or
Power.Set or Union or Replacement or Pairing,
but A would be logically prior to {x∈A:P(x)}
by some route.
>
Geometry, axiomatic geometry or Euclid's,
is a classical theory, and it's constructive,
there's only expansion of comprehension,
I know what comprehension, restricted.comprehension,
and unrestricted.comprehension are by having seen
set axioms which were called Comprehension,
Restricted.Comprehension, and Unrestricted.Comprehension.
What does 'comprehension' mean where there are no sets?