Prove that the length of the perpendicular
from the origin to the plane passing
through point a^→ and containing the
line r^→ =b^→ +λc^→ is (([a^→ b^→ c^→ ])/(∣b^→ ×c^→ +c^→ ×a^→ ∣)) .
Here [a^→ b^→ c^→ ] = scalar triple product.
a≦7⇒P(!∃x_a )=0,
b≦9⇒Q(!∃y_b )=0 for a, b∈N
And A⊋A′: A={(x, y)∣P(x)∙Q(y)=0}=A′,
B_(∈A) ={(x, y)∈A∣x=y}
Then ∀t∈N: ∣B∣=n(t)=f(P(x), Q(y)),
also only t can be in [N, M].
find M.
:(
let u_n =Σ_(k=1) ^n (((−1)^([k]) )/k) and H_n =Σ_(k=1) ^n (1/k)
1)calculate u_n interms of H_n
2)study the convergence of (u_n )
3)study theconvergence of Σ u_(n.)