3 problems

Let $G$ be a $(c,d,\alpha,\delta)$-bipartite expander and let $C_0\subseteq\mathbb{F}_2^d$ be an inner code with minimum Hamming distance $d(C_0)\ge d_0$. Let…

Integer-cohomology conjecture. The dominant part of $H^1(\mathcal X;\bF_2)$ comes from the free part $\bZ^k\cong H^1(\mathcal X;\bZ)$ rather than the torsion part…

Stronger pseudocodeword weight conjecture. The resulting LDPC code has