Full Idea
When the logical form of a statement is offered as the grounds for the judgement that it cannot be true we have logical necessity.
Gist of Idea
Logical necessity is grounded in the logical form of a statement
Source
Harré,R./Madden,E.H. (Causal Powers [1975], 1.V.B)
Book Reference
Harré,R/Madden,E.H.: 'Causal Powers: A Theory of Natural Necessity' [Blackwell 1975], p.19
A Reaction
This sounds like a truth about logical necessity, but certainly not a full account of it, because contingent statements also have logical form. I can't think of any other criterion than the finding of a contradiction buried in the logical form.
Related Idea
Idea 15229 We say there is 'no alternative' in all sorts of contexts, and there are many different grounds for it [Harré/Madden]