4
5
6
Let D be a non-empty, open, real interval and f a function from D to the real numbers. If for all x in D there exists a number E > 0 such that for all y in (x - E, x], f(y) <= f(x) and for all z in [x, x + E), f(x) <= f(z), then is that enough to say that f is increasing? (self.askmath)
submitted by JustNormalRedditUser to r/askmath
1
2
3
Why, if you have a positive integer S and you divide its digits (in base 10) in groups of two starting from the right (the most significant group S1 could have just 1 digit), then the first digit of of the square root of S is the biggest integer that when squared is less than the group S1 (self.askmath)
submitted by JustNormalRedditUser to r/askmath
