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Convergence of series, sequences and functions and different modes of convergence.

9 votes
1 answer
549 views

Does the sequence formed by Intersecting angle bisector in a pentagon converge?

I asked this question on MSE here. Given a non-regular pentagon $A_1B_1C_1D_1E_1$ with no two adjacent angle having a sum of 360 degrees, from the pentagon $A_nB_nC_nD_nE_n$ construct the pentagon …
16 votes
3 answers
4k views

Is it known that the Collatz-like sequence with 7n+1 diverges to infinity starting with 7?

In this question I was wondering if the $3$ in the Collatz conjecture is arbitrary, and when I wrote that question I tried to change to $7n+1$ starting with the seed number $7$, the sequence appears t …
5 votes
2 answers
431 views

What is the limit of the sequence of iterated cosines?

I asked this question on MSE here. Define $f_1(z) = \cos(z)$, $f_{n+1}= \cos(f_n (z)) $, The question is: Does $\lim\limits_{n \to \infty}f_n(z)$ exist for certain $z \in \mathbb{C}$? And what is th …
9 votes
1 answer
840 views

Convergence of sequences formed by orthocenters, incenters, and centroids in repeated triang...

I asked this question on MSE here. Given a scalene triangle $A_1B_1C_1$ , construct a triangle $A_{n+1}B_{n+1}C_{n+1}$ from the triangle $A_nB_nC_n$ where $A_{n+1}$ is the orthocenter of $A_nB_nC_n$, …