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 Sep 15 revised Is it true or false : p↔q does not imply p→¬q? No need for the initial "I have a doubt" Jun 8 revised Why do the equations $Ax + By + Cz= D$ represent planes in $\Bbb R^3$ and not lines? The previous edit messed the title. Nov 6 revised does $\int_0^\infty x/(1+x^2 \sin^2x) \mathrm dx$ converge or diverge? Perhaps this is a better presentation of the proof's logic Nov 3 revised How many possible color combinations? deleted 1 character in body Jul 31 revised Are all fields vector spaces? grammar corrections. Not sure about the phrasing of the last sentence, seems still wrong. Apr 4 revised What does $2^x$ really mean when $x$ is not an integer? correction on exponents formula Aug 5 revised Evaluate $\lim\limits_{n\to \infty}\frac{1}{n+1}+\frac{1}{n+2}+\cdots+\frac{1}{6n}$ edited body Nov 24 revised A new imaginary number? $x^c = -x$ added 114 characters in body Feb 26 revised Designing an Irrational Numbers Wall Clock added 144 characters in body Feb 25 revised Designing an Irrational Numbers Wall Clock added 62 characters in body