vstd: lemma 1 << n is pow2(n)
#1856
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Should we generalize this to something that says |
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Provide lemmas
lemma_uN_one_shl_is_pow2that1 << nis equal topow2(n). Basic fact come up in crypto proofs and general bit manipulation.By submitting this pull request, I confirm that my contribution is made under the terms of the MIT license.