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The Weak Vopênka Principle for definable classes of structures

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We give a level-by-level analysis of the Weak Vopěnka Principle for definable classes of relational structures ( WVP ), in accordance with the complexity of their definition, and we determine the large-cardinal strength of each level. Thus, in particular, we show that WVP for $\Sigma_2$-definable classes is equivalent to the existence of a strong cardinal. The main theorem (Theorem 5.11) shows, more generally, that WVP for $\Sigma_n$-definable classes is equivalent to the existence of a $\Sigma_n$-strong cardinal (Definition 5.1). Hence, WVP is equivalent to the existence of a $\Sigma_n$-strong cardinal for all $n<\omega$.

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BAGARIA, Joan and WILSON, Trevor M. The Weak Vopênka Principle for definable classes of structures. Journal of Symbolic Logic. 2023. Vol. 88, num. 1. ISSN 0022-4812. [consulted: 30 of June of 2026]. Available at: https://hdl.handle.net/2445/217385

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