Order, lattices, ordered algebraic structures

The 4 problems with a statement whose AMS attribute names 06, Order, lattices, ordered algebraic structures, in the Mathematics Subject Classification. A problem with statements in several subjects is listed under each; its article sits in its source folder's part.

• Erdős Problem 497
• The \(\frac 1 3\)–\(\frac 2 3\) conjecture
• Dedekind Numbers
• Conjecture 21.149

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