일간 보관물: 2011/12/25

행렬식으로 결정하기

e^{ax} cos bx 와 e^{ax} sin bx 의 부정적분 계산

Let f(x) be defined on an interval I=(-1,1) and suppose that f(c)≠0 at some c∈I where f is continuous. Use the ‘ε-δ argument’ to show that there is an interval (c-δ,c+δ)⊂I about c such that f(x)f(c)>0 for every x∈(c-δ,c+δ).

The number 26, between 25 and 27 : Resolution of the diophantine equation y^3 − x^2 = 2 http://www.normalesup.org/~baglio/maths/26number.pdf 26number