"Everyday Mathematics" serial 58: February 27

2 month 27 Japan XXVII

Mathematical maxims

Although some people say that life is just a dream , And the world is nothing more than an illusion , But I want to say that this dream or illusion is real enough —— As long as we think well and have never been deceived by them . —— Gottfried · Leibniz （Gottfried Leibniz）

Mathematical problems

Ancient and Modern Commentaries

∞ + ∞ = ？ , ∞ − ∞ = ？ \infty+\infty=？,\infty-\infty=？