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Apr
28
reviewed Close How many onto functions are there from a set with $5$ elements to a set with $3$ elements?
Apr
22
answered How to apply the chain rule to $det A=\sum^n _{r=1} A_{ir} (cof A)_{ir}$?
Apr
19
reviewed Close Solve integral of delta-function
Apr
19
comment How to prove this formula involving the push-forward funtion
The first part showed that vector in tangent space of $M$ is sended by $f_\ast$ into which one in tangent space of $N$, exactly.
Apr
19
comment Prove that $p-$form $\omega$ on $M\times N$ is $\delta \pi(\alpha)$ iff $i(X)\omega=0$ and $L_X\omega=0$
Note that $(x,y)$ is chart for $M\times N$ so that $\omega$ is a combination of wedge products of $dx_i,\ dy_j$ But $\pi^\ast dy_i=dy_i$ so that $dx_i$ can not appear
Apr
19
revised Prove that $p-$form $\omega$ on $M\times N$ is $\delta \pi(\alpha)$ iff $i(X)\omega=0$ and $L_X\omega=0$
added 48 characters in body
Apr
19
comment Prove that $p-$form $\omega$ on $M\times N$ is $\delta \pi(\alpha)$ iff $i(X)\omega=0$ and $L_X\omega=0$
You are right I see I will correct it
Apr
19
accepted Proof of coarea formula
Apr
19
answered Prove that $p-$form $\omega$ on $M\times N$ is $\delta \pi(\alpha)$ iff $i(X)\omega=0$ and $L_X\omega=0$
Apr
19
revised How to prove this formula involving the push-forward funtion
added 843 characters in body
Apr
19
answered How to prove this formula involving the push-forward funtion
Apr
16
reviewed Close Does every connected metric space , with more than one point , contains a path connected subset with more than one point ?
Apr
16
reviewed Close Determine whether or not the following series is convergent $\sum_{n=1}^\infty \frac{1}{n^n}$
Apr
16
reviewed Close Find $\lim_{x \to -2, \ x < 2} \frac {2x+2} {x^2+x-2}$
Apr
16
reviewed Close Inverse image of a normal subgroup by a group homomorphism is a normal subgroup
Apr
16
reviewed Close Proving a trigonometric identity:
Apr
16
reviewed Close True or false under several conditions
Apr
15
reviewed Close Is R/m a flat R-module?
Apr
15
reviewed Close Proof for generators of cyclic group
Apr
15
reviewed Leave Open Basic Symmetric Group Question