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Discrete mathematics of RTVU
( 1)R = { & lt; 2,2 & gt; ,& lt2,6 >,& lt2 12 >,& lt2,24 >,& lt3,3 & gt; ,& lt3,6 >,& lt3, 12 >,& lt3,24 >,& lt6,6 >,& lt6, 12 >,& lt6,24 >,& lt 12, 12 & gt; ,& lt 12,24 & gt; ,& lt24,24 >}

(2)R is spontaneous, antisymmetric and transitive, so R is a partial order relation.

(3) Omission

(4) The largest element of B: 12.

Maximum element: 12

Upper bound: 12

The answer is not easy, please adopt it in time, thank you!