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    Both theories preserve bijection-non-existence; calling o... — Carmelics
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    Challenges→Quine's original NF and Jensen's NFU differ in that NFU's urelements create asymmetry: V and ℘₁(V) can have different cardinalities, making the bijection's non-existence a cardinality fact, not merely a stratification fact.

    Both theories preserve bijection-non-existence; calling one 'cardinality fact' and the other 'stratification fact' may be terminological, not substantive.

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    Quine's original NF and Jensen's NFU differ in that NFU's urelements create asym...

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    Quine's original NF and Jensen's NFU differ in that NFU's urelements create asym...

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