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I started a page logicality and invariance. In Bristol the other day, Steve Awodey was promoting the thought that HoTT is a realisation of that thrust to understand logic as maximally invariant.
What would it be to take that seriously? If invariants are picked up by dependent product in some $\mathbf{B} Aut$ context, could there be a useful context $\mathbf{B} Aut(\mathcal{U})$ for the universe $\mathcal{U}$?
An attempt to work things out for a form of type theory:
Maybe include this quotation from that Tarski paper? [bottom of page 8]
Now suppose we continue this idea, and consider still wider classes of transformations. In the extreme case, we would consider the class of all one-one transformations of the space, or universe of discourse, or ’world’, onto itself. What will be the science which deals with the notions invariant under this widest class of transformations? Here we will have very few notions, all of a very general character. I suggest that they are the logical notions, that we call a notion ’logical’ if it is invariant under all possible one-one transformations of the world onto itself.
It is quite succinct and as Corcoran says in footnote 5, “Apart from Mautner 1946, which Tarski seems not to have known, this is, I believe, the first attempted application in English of Klein’s Erlanger Programm to logic.”
Yes, by all means include that quote.
Slightly odd wording by Corcoran. Why not say
Apart from Hillary and Tenzing 1953, Ernst Reiss and Fritz Luchsinger were the first men to climb Everest?
I don’t see what Tarski’s ignorance of Mautner has to do with it. The latter hardly hid his intentions:
F. I. Mautner, An Extension of Klein’s Erlanger Program: Logic as Invariant-Theory
Apart from a billion or so people, I’m the fastest man alive.
Regarding Corcoran’s wording. Noted.
I’ve made the edit. As it’s my first on this site can you check it to make sure that it is alright? Thanks! Should I add the DOI http://dx.doi.org/10.1080/01445348608837096 of Tarski’s paper? I have a copy of the PDF but it is copyrighted so I ought not link to it I guess.
Looks fine to me, but David C is more of an expert in the subject matter. I went ahead and took the liberty of adding the doi myself.
Another factor in Mautner’s favour for you, Anthony, is that he was working in Dublin at the time.
Let’s give him a page Friederich Mautner.
Thank you David R! Interesting factoid David C! I must get to know a bit about Mautner.
Mentioned what he calls there the Tarski-Grothendieck Thesis
If a statement, concept, or construction is purely logical, then it should be invariant under all equivalences of the structures involved. A statement that is not invariant must involve some non-logical specifics, pertaining not to general logical form but to some particular aspects of the objects bearing the structure. If it is the hallmark of a logical concept that it should pertain only to general, formal structure and not to any specific features of the objects bearing that structure, then this formal character may be witnessed by the fact that the concept is invariant under all equivalence transformations.
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