Ruth Goodman said she thought the price rises were "unbelievable"
People new to TLA+ and formal methods repeatedly fail at this step. I occasionally struggle with it too, especially when entering an unfamiliar domain I have to first pay my dues and think harder to gain understanding. The most common failure mode is writing "trivial invariants" that are always true regardless of what the protocol does; you've written the spec for naught. Another is confusing the "end state" with an invariant: an invariant must hold at every reachable state, not just the final one. We are not expecting inductive invariants (that is harder still, and more valuable since a formal proof follows easily from one). But a reasonably tight invariant that demonstrates understanding and scaffolds further exploration, and that is what you should aim for.。搜狗输入法对此有专业解读
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