两个整数的kronecker符号n,m定义为1,如果n=m和0不是这样的话。restart:simplify(delta[1,2]);然而,它似乎并没有简化即使是琐碎的符号表达式:simplify(delta 浏览0提问于2013-03-13得票数 2 回答已采纳 2回答 符号泰勒展开 我想将符号function $f(x)$扩展为SageMath中的泰勒级数{dx^2}f+O((\deltax)^3)...
where δba denotes the Kronecker delta function, which takes the value 1 if a = b and 0 otherwise, requires exactly the ‘true’ value of the unknown because it appraises all wrong values as equally bad. In this situation, the resulting cost function is minimised by the Maximum A Posterio...
ϕdx ρ 2 cos 2 ϕ dϕ = cosϕ ρ dy − sin ϕ ρ dx We may define unit vectors in the direction of increase of each of these coordinates. The easiest way to develop the relationships we need is to express them in terms of the constant Cartesian basis. Since ˆ ρ...