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visits member for 2 years, 10 months
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Jan
15
answered How to fast convert from Octal to Hexadecimal
Dec
13
comment Expand in factor when even and odd power is given
for $n=2$ there is no factorization unless you go with imaginary numbers $(A+Bi)(A-Bi)$
Dec
10
answered $1/i=i$. I must be wrong but why?
Dec
6
answered Prove by induction that $5^n - 1$ is divisible by $4$.
Dec
6
comment Prove by induction that $5^n - 1$ is divisible by $4$.
@user17762 $25 * 5 = 25 \mod 100$
Dec
2
revised What is the purpose of the first test in an inductive proof?
mathjax fixin
Dec
2
suggested suggested edit on What is the purpose of the first test in an inductive proof?
Nov
18
comment if matrix such $AA^T=A^2$ then $A$ is symmetric?
$AA^T=AA \Rightarrow A^{-1}AA^T=A^{-1}AA\Rightarrow A^T=A$
Nov
11
answered Measuring water puzzle
Nov
9
awarded  Student
Nov
9
revised How stable is my quaternion interpolation?
added 6 characters in body
Nov
8
asked How stable is my quaternion interpolation?
Nov
6
comment How can I determine that a relation lacks a property without using a counterexample?
you can try to find a contradiction with the assumption that the property holds for all, this proof by contradiction will also allow you to construct a counterexample
Oct
31
answered Exponential equation in x,y,z
Oct
26
comment What is the simplest proof of the pythagorean theorem you know?
@KeshavSrinivasan moreover it's easy to create a contraption like that in real life that proves $a^2+b^2$ is greater or less than $c^2$ by adjusting the depth
Oct
11
awarded  Yearling
Oct
3
comment Riddle: 1 question to know if the number is 1, 2 or 3
@Oleg567 what would you reply be if I gave you the command to say "no" if your number is 1, "don't know" if your number is 2, or "yes" if your number is 3?
Aug
29
comment Find the trace of the matrix?
the diagonal matrix with distinct numbers on the diagonal fits the description
Aug
27
answered Would the answer of the square root of a square root be positive or negative?
Aug
14
comment Notations that are mnemonic outside of English
@detly but much less funny