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Jino
  • Member for 13 years, 1 month
  • Last seen more than 8 years ago
19 votes
3 answers
930 views

What is the generator of $\pi_9(S^3)$?

13 votes
6 answers
4k views

What is the best way to study Rational Homotopy Theory

13 votes
3 answers
3k views

Is there the Whitehead theorem for cohomology theory?

7 votes
2 answers
1k views

All mapping space between CW complexes is a CW complex?

5 votes
5 answers
2k views

What is a basic textbook to studying symmetric spaces?

4 votes
3 answers
788 views

What is the best paper or book studying the P homomorphism, J homomorphism and Hopf invariant in Homotopy theory?

4 votes
2 answers
1k views

The fundamental group of space which has both an H and a co-H structure

3 votes
0 answers
550 views

When a quasifibration is a Hurewicz fibration?

2 votes
1 answer
355 views

What is the group O(4)/H, where H is the center of O(4)?

1 vote
2 answers
306 views

$\pi_n(f)=0$ implies $f\simeq \ast$? $H_n(f)=0$ implies $f\simeq \ast$?

1 vote
1 answer
215 views

$h \simeq \Sigma \omega$? where $h:S^7 \to S^4$ the Hopf map and $\omega$ is a generator of $\pi_6(S^3)=\mathbb{Z}_{12}$?

0 votes
1 answer
169 views

Is there a Lie group which is made $S^n \cup_f ~e^m$?

0 votes
1 answer
200 views

what is the image of $\partial( 1_{S^n})$ for the exact sequence for the fibration $X \to E \to S^n$

0 votes
0 answers
184 views

the boundary homomorphism $[\Sigma S^{n-1},X]\to[S^n,X]$ is identity?