I don’t know documentation you looked at.From a user’s perspective, Leslie Lamport’s video lectures [1] and/or Hillel Wayne’s Web site and book [2] are probably the best introduction (with the latter focusing on PlusCal, but this includes TLA+ expressions).If you are looking for more mathematical descriptions covering the language and its semantics, Specifying Systems [3], the original paper introducing TLA (but not the specification language TLA+) [4] or an old paper of mine [5] may be helpful.Hope this helps,StephanOn 19 May 2024, at 12:44, marta zhango <marta...@xxxxxxxxx> wrote:I actually need some nitpicking. TLA is a scheme for precise and clear description,whereas the documentation is not.What are the basic constructs then ? As this is what I would like to neatly summarise.On Sunday, May 19, 2024 at 9:38:51 PM UTC+12 Stephan Merz wrote:In fact, there is no such thing as "statements" in TLA+, only formulas of different levels (constant, state, action, temporal). This is not nitpicking, but quite a fundamental distinction.StephanOn 19 May 2024, at 11:24, marta zhango <marta...@xxxxxxxxx> wrote:Have seen that statements in TLA are of the form [A]_p, where A is an action and p is a property.But what are things without action formalism likeCardinality(assignments[t])and expressions such as/\ assignments \in [Tasks -> SUBSET CPUs]
and
IsSorted(seq) == \A i, j \in 1..Len(seq): i < j => seq[i] <= seq[j]
What are the latter ? Because they do not look like TLA statements
in the form of [A]_p.--
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