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Step * of Lemma ispair-bool-if-bunion-unit-prod

∀[t:Unit ⋃ (Top × Top)]. (ispair(t) ∈ 𝔹)
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Latex:

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Latex:
\mforall{}[t:Unit  \mcup{}  (Top  \mtimes{}  Top)].  (ispair(t)  \mmember{}  \mBbbB{})


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Latex:
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