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Step * 1 of Lemma equal-bnot


1. x : 𝔹
2. y : 𝔹
3. ¬↑y
4. ¬¬↑x
⊢ ↑x
BY
{ SupposeNot }

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Latex:

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Latex:

1.  x  :  \mBbbB{}
2.  y  :  \mBbbB{}
3.  \mneg{}\muparrow{}y
4.  \mneg{}\mneg{}\muparrow{}x
\mvdash{}  \muparrow{}x


By

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Latex:
SupposeNot

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