然而，随着数据量的爆发增长，DRAM及NAND在耗电量及数据访问速度上依旧无法跟上需求的脚步。他们在需要高速运算的应用场景中也有一些阻碍。
Hence this essay. Before I get started, I would like to put a plug for
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There is a special form for boolean formulas called "Conjunctive Normal Form" (CNF). A problem in this form consists of clauses connected with and operators, where each clause only contains variables connected with or operators. The variables can appear negated, but only variables can be directly negated, something like !(a && b) is not allowed. An example boolean formula in CNF form is:
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