Surface subgroups of graphs of free groups
53 mins 23 secs,
204.14 MB,
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480x270,
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44100 Hz,
522.11 kbits/sec
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About this item
| Description: |
Wilton, H
Wednesday 21st June 2017 - 11:30 to 12:30 |
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| Created: | 2017-07-19 15:03 |
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| Collection: | Non-Positive Curvature Group Actions and Cohomology |
| Publisher: | Isaac Newton Institute |
| Copyright: | Wilton, H |
| Language: | eng (English) |
| Distribution: |
World
(downloadable)
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| Explicit content: | No |
| Aspect Ratio: | 16:9 |
| Screencast: | No |
| Bumper: | UCS Default |
| Trailer: | UCS Default |
| Abstract: | A well known question, usually attributed to Gromov, asks whether every hyperbolic group is either virtually free or contains a surface subgroup. I’ll discuss the answer to this problem for the class of groups in the title when the edge groups are cyclic. The main theorem is a result about free groups F which is of interest in its own right: whether of not an element w of F is primitive can be detected in the abelianizations of finite-index subgroup of F. I’ll also mention an application to the profinite rigidity of the free group. |
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| MPEG-4 Video | 640x360 | 1.94 Mbits/sec | 777.53 MB | View | Download | |
| WebM | 640x360 | 888.58 kbits/sec | 347.54 MB | View | Download | |
| iPod Video * | 480x270 | 522.11 kbits/sec | 204.14 MB | View | Download | |
| MP3 | 44100 Hz | 249.79 kbits/sec | 97.76 MB | Listen | Download | |
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