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 Oct 24 answered Find an integer such that when squared, the first 4 digits are '6666'. Oct 18 comment Is there a way to get trig functions without a calculator? If there weren't a way to evaluate trig functions without a calculator, then how would anyone be able to program the calculators? Aug 21 awarded Yearling Aug 17 answered What can you say about a number with remainder 1 and 2 when divided by 3 and 4 respectively? Jul 13 awarded Pundit Jun 24 comment Why do calculus students learn to think of the derivative as a limit? How else would you define it? Jun 20 comment How to solve $2^x+e^x=400$ @HenningMakholm: As an extreme example, consider Fermat's Last Theorem. Easy to state, but took 358 years to prove. Jun 20 comment Why isn't the empty set an element of $A \times B$, while it is a relation from $A$ to $B$? If you're a computer programmer (in a statically-typed language with templates/generics), it may help to think of the × operation as the function Set< Pair > CartesianProduct(Set a, Set b). The return value can be an empty set, but it can't contain an empty set because then the type would have to be Set instead of Set. Jun 4 comment Name of the highest power of 2 smaller than or equal to a given number "Two to the Power of the Floor of the Base-Two Logarithm" = TPFBTL of x, pronounced kinda like "top of bottle". Jun 2 comment Show that the question “Is there life beyond earth?” is decidable The question can straightforwardly be answered by the Python (a Turing-complete language) expression any(obj.location != Earth and obj.alive for obj in universe()). The only hard part is iterating every object in the universe. But if you assume a finite universe, it's theoretically possible. May 29 answered Is it an abuse of notation to omit the leading zero in a decimal less than 1? Jan 26 comment Can you be 1/12th Cherokee? @Keavon: Technically, the protagonist of that song is his own step-grandfather, not his own biological grandfather. Dec 30 answered What would be the center of the curvature? Dec 30 comment Why rationalize the denominator? @Ooker: Note the "floor" brackets. Dec 9 awarded Caucus Oct 22 awarded Nice Answer Sep 12 answered Trignometric problem (using De Movier's Theorem) Sep 12 comment In plain language, what's the significance of a field? @Hal: Not always. Another thing that would keep a field from having less/greater than is the numbers being conceived of two-dimensionally. Think of $\mathbb{C}$. Sep 10 awarded Good Question Aug 21 awarded Yearling