# Gustavo Bandeira

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bio website goo.gl/LXAe1 location Recife, Brazil age 24 member for 1 year, 9 months seen 7 hours ago profile views 2,014

# Hello!

I am self-learning mathematics at the moment. My interest on mathematics was completely destroyed in high-school, after years ignoring it I've discovered it's interesting and beautiful. Now I'm planning to study it on university and even pursue a masters and a Ph.D! Yay!

I am very grateful for your $Time \cup Patience \cup Answers$. If my question is too stupid, blame these answerers.

Sometimes I do ask somethings that must be understood as obvious - this is perfectly normal: Some time ago I presumed that the factorial of $0$ is $0$, because I was following the pattern:

• $3!=6$
• $2!=2$
• $1!=1$
• $0!$ had to be $0$

I even thought that the guy who wrote the article saying that $0!=1$ was a complete dumbass, then I discovered I was the dumbass. This made me accept that I know nothing and things that are regarded as obvious sometimes aren't - I prefer to ask such obvious stuff than to carry a wrong intuition about it. Cool stuff that being smart isn't really knowing everything, It's mostly about knowing if you know.



Sometimes I like to explore mathematics, such as this, this or this. And sometimes I write it in a poor way because of my lack of knowledge. I expect people not to hate me for such explorations.

If you want to talk, you can e-mail me: $gioxis@gmail \cdot com$

I am also a pseudo musician, I study piano and I used to make music with my computer.

# 104 Accepts

 Nov6 accepted When proving that there is not rational number $m/n$ equal to $\sqrt{2}$, why does $m$ and $n$ must be not both even? Oct31 accepted Barbeau's Polynomials, Exploration 2 Oct28 accepted How to solve this class of problems? Aug14 accepted Why they use the word “abstract” for naming mathematical fields of study? Aug7 accepted Is there a specific reason to choose $3$ and $1$ for evaluating these limits? Aug7 accepted How to find the area of an isoceles triangle when only the length of the two equal sides is given? Jul26 accepted Are there algebraic structures with more than one neutral element and/or more than one inverse element? Jul26 accepted Why is that interior points exist only inside intervals on $\mathbb{R}$? Jun25 accepted How to find the base $n$ such that $2_{n}^{12_n}=2_{10}^{6_{10}}\cdot 5_{10}$? Jun23 accepted How's it possible for each element of the empty set to be even? Jun23 accepted Is there an algorithm to read this mathematical definition? Jun23 accepted Is there a difference between abstract vector spaces and vector spaces? Jun11 accepted Where's the error in this $2=1$ fake proof? Jun10 accepted Is it possible to derive all the other boolean functions by taking other primitives different of $NAND$? Jun9 accepted What should be proved in the binomial theorem? Jun9 accepted Is there a mathematics field that studies the displaying of numbers? Jun6 accepted How to plot biconditional graphs? Jun2 accepted Show that $S\cap(T\,\cup \,T') = (S\,\cap\,T)\cup(S\,\cap\,T')$ Jun1 accepted Proving that ${n}\choose{k}$ $=$ ${n}\choose{n-k}$ May28 accepted What's so well in having a least element in a set?