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 Apr18 awarded Notable Question Apr12 awarded Popular Question Mar10 awarded Popular Question Feb28 awarded Favorite Question Feb19 awarded Famous Question Jan25 comment Importance of rigor "There was no real theoretical mathematics as we have today, and in fact if you look closely you will see that many mathematicians from that time were also physicists, chemists and alchemists." I would like to read more about this idea, do you know any good sources ? Jan24 asked No rigorous proofs from 200 B.C to 1870? Jan24 comment How can you come to the truth of a statement without proving it? @russoo I thought that the definition of a statement is that it is either true or false, right ? so I would say such a stament $\phi$ is just not a well defined statement. Jan24 revised How can you come to the truth of a statement without proving it? added 69 characters in body Jan24 comment How can you come to the truth of a statement without proving it? @AsafKaragila Well, actually one of my quotes in this question, is from your answer to the top voted incompleteness question.. I did take some time, but agreed I could have taken some more time. Jan24 asked How can you come to the truth of a statement without proving it? Jan20 awarded Notable Question Jan14 awarded Favorite Question Dec22 awarded Famous Question Dec19 awarded Constituent Dec12 accepted Showing that $\int_{a}^{b} \frac{(x-x_1)(x-x_2)}{(x_0 - x_1)(x_0-x_2)} dx = \int_{-1}^{1} \frac{t(t-1)}{2} \frac{b-a}{2} dt$ Dec9 wiki Dec9 awarded Caucus Dec6 comment Show $P(X(t)=0 | X_{0}=2)= P(X(t)=0 | X_{0}=1)^{2}$ @Mehdi I posted it below. Dec6 answered Show $P(X(t)=0 | X_{0}=2)= P(X(t)=0 | X_{0}=1)^{2}$