Recent content by xxxmisko

Hello! I would like to ask everybody with vigenere autokey cipher. The type of encryption: PlainText: THISISMYTEXT Key: ONETHISISMYT Ciphertext: HUMLPAEGLQVM If has sbd autobreaker for this, please help me. Have a nice day

Let (zero) ∅≠M⊂R. Point a∈R is accumulation point of set M, if for every O_{ε}°(a) exists x∈M, x∈O_{ε}°(a). I hope that there will be no problem with syntax, because I am not using LaTex yet

I do not know, how do you think it, but this is example for my closed set Closed interval [a,b] is closed subset of real numbers We have not in school definition of closed and opened set yet. But we are working with functions too, also it should be a definition of intervals of the function...

Homework Statement Hello, I am here a novice and my English is very bad. I am a student and now we learning about sets. I have got a problem, how to proof, that every closed set contains all accumulation points? I know / hope, that should, but I want to proof it. I hope, that somebody will...