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Mar
16
awarded  Popular Question
Feb
19
comment Precise definition of limit
@Valentino: oh, man, I have that book, and it is not that straightforward. :-O
Feb
19
comment Probability and dice rolls
+1 I programmed a simulation that corroborates this.
Feb
19
comment Intervals of Convex and Concave function
You correctly found the point where the second derivative of the function changes its sign. Now, what you call each half is irrelevant, really. However, if rain falls from above, then $x>\ln1/2$ will collect water because it is concave.
Feb
19
revised How to prove a recurrence with multiple terms?
Used LaTeX
Feb
19
suggested approved edit on How to prove a recurrence with multiple terms?
Feb
19
answered Robot on a grid. Find if it can reach a certain position.
Feb
19
asked The $8$-Puzzle and $2$-Cycles
Feb
16
awarded  Yearling
Jan
16
accepted Are all functions $f:\mathbf{Z}\to\mathbf{Z}$ “continuous”?
Jan
16
asked Are all functions $f:\mathbf{Z}\to\mathbf{Z}$ “continuous”?
Jan
11
awarded  Popular Question
Dec
10
comment
@Bak1139, are you familiar with clicking users' profiles to deduce whether they know how the system works?
Dec
10
awarded  Caucus
Nov
28
comment Bipartite Graph and Non-connected node?
Do you know what it means for a graph to be bipartite?
Nov
28
comment Naturality of $n$-truncation
Please fix the title of your question.
Nov
28
revised Derivation of Simple Projectile Motion with Drag
deleted 13 characters in body
Nov
27
comment Derivation of Simple Projectile Motion with Drag
I see. So I have to treat the components individually.
Nov
27
accepted Derivation of Simple Projectile Motion with Drag
Nov
27
revised Derivation of Simple Projectile Motion with Drag
deleted 2 characters in body