نتایج جستجو برای: sign function
تعداد نتایج: 1261484 فیلتر نتایج به سال:
The sign-rank of a matrix A with entries in {−1,+1} is the least rank of a real matrix B with Aij · Bij > 0 for all i, j. Razborov and Sherstov (2008) gave the first exponential lower bounds on the sign-rank of a function in AC, answering an old question of Babai, Frankl, and Simon (1986). Specifically, they exhibited a matrix A = [F (x, y)]x,y for a specific function F : {−1, 1} × {−1, 1} → {−...
We show how to cheaply estimate the Fr echet derivative and the condition number for a general class of matrix functions (the class includes the matrix sign function and functions that can be expressed as power series) via the Schur decomposition. In the case of the matrix sign function we also give a method to compute the Fr echet derivative exactly. We also show that often this general method...
In the early events of human immunodeficiency virus type 1 (HIV-1) infection, immature dendritic cells (DCs) expressing the DC-specific intercellular adhesion molecule 3-grabbing nonintegrin (DC-SIGN) receptor capture small amounts of HIV-1 on mucosal surfaces and spread viral infection to CD4(+) T cells in lymph nodes (22, 34, 45). RNA interference has emerged as a powerful tool to gain insigh...
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