... principles.¹

(bluehttps://www.cambridge.org/core/journals/journal-of-symbolic-logic/article/abs/on-ramseys-theorem-and-the-existence-of-infinite-chains-or-infinite-antichains-in-infinite-posets/5CDBE195B822A73E6B1ACA733989BDB8

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... CLASS="MATH">$k$'.²

(bluehttps://www.semanticscholar.org/paper/The-chromatic-number-of-the-product-of-two-graphs-Hajnal/7bce2a70e5a44bc07aafd20afdac74df6f17ecbc)

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....³

Also independently observed by the author.

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