ratchet freak
Reputation
1,407
Top tag
Next privilege 2,000 Rep.
 Dec13 comment Expand in factor when even and odd power is given for $n=2$ there is no factorization unless you go with imaginary numbers $(A+Bi)(A-Bi)$ Dec10 answered $1/i=i$. I must be wrong but why? Dec6 answered Prove by induction that $5^n - 1$ is divisible by $4$. Dec6 comment Prove by induction that $5^n - 1$ is divisible by $4$. @user17762 $25 * 5 = 25 \mod 100$ Dec2 revised What is the purpose of the first test in an inductive proof? mathjax fixin Dec2 suggested approved edit on What is the purpose of the first test in an inductive proof? Nov18 comment if matrix such $AA^T=A^2$ then $A$ is symmetric? $AA^T=AA \Rightarrow A^{-1}AA^T=A^{-1}AA\Rightarrow A^T=A$ Nov11 answered Measuring water puzzle Nov9 awarded Student Nov9 revised How stable is my quaternion interpolation? added 6 characters in body Nov8 asked How stable is my quaternion interpolation? Nov6 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 Oct31 answered Exponential equation in x,y,z Oct26 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 Oct11 awarded Yearling Oct3 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? Aug29 comment Find the trace of the matrix? the diagonal matrix with distinct numbers on the diagonal fits the description Aug27 answered Would the answer of the square root of a square root be positive or negative? Aug14 comment Notations that are mnemonic outside of English @detly but much less funny Aug14 awarded Nice Answer