# Gustavo Bandeira

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bio website goo.gl/LXAe1 location Recife, Brazil age 24 member for 1 year, 9 months seen 3 hours ago profile views 2,001

# 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.

# 163 Questions

 86 Can you provide me historical examples of pure mathematics becoming “useful”? 26 Where are the values of the sine function coming from? 25 Is this way of teaching how to solve equations dangerous somehow? 25 Are there infinite sets of axioms? 21 What are the dangers of visual exposition of mathematics?

# 3,468 Reputation

 +20 Is there a proof of the irrationality of $\sqrt{2}$ that involves modular arithmetic? +5 Are there trials of finding a general solution for polynomials of $n^{th}$ degree with other operations? +5 Why do they print the number of Illustrations on some mathematics books? +5 How to check the rationality of a number?

 3 How to write in $2^x=5$ in logarithmic form? 2 Suggestions for Studying for Real Analysis/Linear Algebra 1 Non-rigorous (maybe a good pop-math) book about real analysis? 1 Applications of Category Theory Outside of Mathematics (the discipline) 1 Are primes randomly distributed?

# 101 Tags

 3 real-analysis × 13 2 linear-algebra × 3 3 logarithms × 3 2 probability × 3 2 reference-request × 30 1 advice × 6 2 soft-question × 22 1 prime-numbers × 4 2 homework × 4 1 number-theory × 4

# 46 Accounts

 Mathematics 3,468 rep 11456 Mathematica 1,080 rep 222 Stack Overflow 454 rep 39 Philosophy 261 rep 110 Android Enthusiasts 223 rep 110