Sep
6
comment Suppose $x$ is an odd function and let $h = f \circ g$. Is h always an odd function?
what is $x$ in the title?
Sep
6
revised Suppose $x$ is an odd function and let $h = f \circ g$. Is h always an odd function?
latex int title
Sep
5
comment Showing Surjectivitity of $f(x) = x^3$
that is not a sufficient condition, e.g. $f:x \mapsto e^x $ is strictly increasing and unbounded but not not surjective
Sep
5
comment Showing Surjectivitity of $f(x) = x^3$
that is not a sufficient condition, e.g. $f:x \mapsto \lfloor{x}\rfloor $ is not surjective
Sep
5
reviewed Approve suggested edit on Showing Surjectivitity of $f(x) = x^3$
Sep
5
revised Are the following two statements about limit true or false? and why?
typo in formula
Sep
4
revised Are the following two statements about limit true or false? and why?
i had to interrupt writing my post becuase of a phone call . now I finishe it
Sep
4
revised Are the following two statements about limit true or false? and why?
i had to interrupt writing my post becuase of a phone call . now I finishe it
Sep
4
revised Are the following two statements about limit true or false? and why?
added 48 characters in body
Sep
4
answered Are the following two statements about limit true or false? and why?
Sep
4
reviewed Approve suggested edit on Algebraic simplifying of $\frac {a + 27}{\sqrt[3]{a} + 3}$
Sep
3
comment Encyclopedia of integers
this is the link to the wiki numbers: en.wikipedia.org/wiki/Category:Integers many of them contain the note "This article may contain excessive, poor, or irrelevant examples..."
Sep
3
comment At what time and distance from Delhi will the mall train completely cross the goods train?
The problem statement is incomplete. See my comment to Deuteu's solution. Can you solve the problem if the length of the trains is ignored (is equal 0)?
Sep
3
comment At what time and distance from Delhi will the mall train completely cross the goods train?
You assume that the front of the goods train is at 6:00 at the same point as the front of the mall train at 12:00. But one can also assume that the end of the goods train at 6:00 is at the same position at the end of the mall train at 12:00. Or anything between this two position. Ora anything else. I think Dehli is a rather large station with a lot of station platforms and they may start from different paltforms. Maybe so it does not make sense to incorporatethe length of the trains into the equations. There impact on the solution is rather small.
Sep
3
comment Prove that $(2m+1)^2 - 4(2n+1)$ can never be a perfect square where m, n are integers
I changed the signs because it seemd to be wrong. But I am not sure about the meaning of the previous comments. IfF my changes were wrong so please undo them
Sep
3
revised Prove that $(2m+1)^2 - 4(2n+1)$ can never be a perfect square where m, n are integers
there where two additional signs change
Sep
3
revised Prove that $(2m+1)^2 - 4(2n+1)$ can never be a perfect square where m, n are integers
changed wrong minus sign to plus, the statements remian true
Sep
3
revised remainder of polynomial division
moved the problem statement from title to body of post. hanged title
Sep
3
comment Where am I going wrong with this Boolean simplification problem?
you must not write down the whole truth table but only one of the rows of the truth table where they differ. for which A, B does the truth table differ?
Sep
3
reviewed Approve suggested edit on Is $1$ a subset of $\{1\}$