Despite 19371, I still have problems getting mathjax to work in the Ipython 
notebook :

Starting from a working directory, to work on a local sheet :

charpent@SAP5057241:~/Boulot/DiversRatiche/Abdelaziz$ sage -n ipython
┌────────────────────────────────────────────────────────────────────┐
│ SageMath Version 6.10.beta0, Release Date: 2015-10-15              │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Warning: this is a prerelease version, and it may be unstable.     ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
Please wait while the Sage Notebook server starts...
[I 14:43:26.353 NotebookApp] Using MathJax: 
../nbextensions/mathjax/MathJax.js
[W 14:43:26.393 NotebookApp] Terminals not available (error was No module 
named terminado)
[I 14:43:26.394 NotebookApp] Serving notebooks from local directory: 
/home/charpent/Boulot/DiversRatiche/Abdelaziz
[I 14:43:26.394 NotebookApp] 0 active kernels 
[I 14:43:26.394 NotebookApp] The IPython Notebook is running at: 
http://localhost:8888/
[I 14:43:26.394 NotebookApp] Use Control-C to stop this server and shut 
down all kernels (twice to skip confirmation).

(process:27610): GLib-CRITICAL **: g_slice_set_config: assertion 
'sys_page_size == 0' failed

*Here I start a local sheet :*

[W 14:43:29.939 NotebookApp] Notebook Mod1.ipynb is not trusted
[I 14:43:30.300 NotebookApp] Kernel started: 
ccfa2cd2-604b-452b-901a-18fc550c444a
[I 14:43:49.870 NotebookApp] Kernel restarted: 
ccfa2cd2-604b-452b-901a-18fc550c444a

Mathjax works OK in the local sheet

[I 14:44:15.435 NotebookApp] Saving file at /Mod1.ipynb
[I 14:44:18.950 NotebookApp] Kernel shutdown: 
ccfa2cd2-604b-452b-901a-18fc550c444a
^C[I 14:44:25.114 NotebookApp] interrupted
Serving notebooks from local directory: 
/home/charpent/Boulot/DiversRatiche/Abdelaziz
0 active kernels 
The IPython Notebook is running at: http://localhost:8888/
Shutdown this notebook server (y/[n])? y
[C 14:44:27.625 NotebookApp] Shutdown confirmed
[I 14:44:27.626 NotebookApp] Shutting down kernels
charpent@SAP5057241:~/Boulot/DiversRatiche/Abdelaziz$

Now, starting from my home directory :

charpent@SAP5057241:~/Boulot/DiversRatiche/Abdelaziz$ cd
charpent@SAP5057241:~$ sage -n ipython
┌────────────────────────────────────────────────────────────────────┐
│ SageMath Version 6.10.beta0, Release Date: 2015-10-15              │
│ Type "notebook()" for the browser-based notebook interface.        │
│ Type "help()" for help.                                            │
└────────────────────────────────────────────────────────────────────┘
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┓
┃ Warning: this is a prerelease version, and it may be unstable.     ┃
┗━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┛
Please wait while the Sage Notebook server starts...
[I 14:44:33.318 NotebookApp] Using MathJax: 
../nbextensions/mathjax/MathJax.js
[W 14:44:33.364 NotebookApp] Terminals not available (error was No module 
named terminado)
[I 14:44:33.365 NotebookApp] Serving notebooks from local directory: 
/home/charpent
[I 14:44:33.365 NotebookApp] 0 active kernels 
[I 14:44:33.365 NotebookApp] The IPython Notebook is running at: 
http://localhost:8888/
[I 14:44:33.365 NotebookApp] Use Control-C to stop this server and shut 
down all kernels (twice to skip confirmation).

(process:27723): GLib-CRITICAL **: g_slice_set_config: assertion 
'sys_page_size == 0' failed
[W 14:44:33.965 NotebookApp] /home/charpent/U: doesn't exist
[W 14:44:33.966 NotebookApp] /home/charpent/G: doesn't exist
[W 14:44:33.968 NotebookApp] /home/charpent/L: doesn't exist
[W 14:44:33.971 NotebookApp] /home/charpent/fauchard-sshfs-lien doesn't 
exist
[W 14:44:33.978 NotebookApp] /home/charpent/G doesn't exist
[W 14:44:33.990 NotebookApp] /home/charpent/alpha-sshfs-lien doesn't exist
[W 14:44:33.993 NotebookApp] /home/charpent/O: doesn't exist
[W 14:44:33.997 NotebookApp] /home/charpent/K: doesn't exist
[W 14:44:34.001 NotebookApp] /home/charpent/alpha-dav-lien doesn't exist

*Here I get a dialog box telling me that mathjax is unavailable.*

[W 14:44:48.352 NotebookApp] 404 GET 
/notebooks/Boulot/DiversRatiche/nbextensions/mathjax/MathJax.js?config=TeX-AMS_HTML-full,Safe&delayStartupUntil=configured
 
(127.0.0.1): No such file or directory: 
Boulot/DiversRatiche/nbextensions/mathjax/MathJax.js
[W 14:44:48.361 NotebookApp] 404 GET 
/notebooks/Boulot/DiversRatiche/nbextensions/mathjax/MathJax.js?config=TeX-AMS_HTML-full,Safe&delayStartupUntil=configured
 
(127.0.0.1) 9.10ms 
referer=http://localhost:8888/notebooks/Boulot/DiversRatiche/Abdelaziz/Mod1.ipynb
[I 14:44:49.319 NotebookApp] Kernel started: 
32ffd7e9-72d9-46ed-8c4a-76d197f67e3a
[I 14:44:59.898 NotebookApp] Kernel shutdown: 
32ffd7e9-72d9-46ed-8c4a-76d197f67e3a
^C[I 14:45:10.810 NotebookApp] interrupted
Serving notebooks from local directory: /home/charpent
0 active kernels 
The IPython Notebook is running at: http://localhost:8888/
Shutdown this notebook server (y/[n])? y
[C 14:45:13.489 NotebookApp] Shutdown confirmed
[I 14:45:13.490 NotebookApp] Shutting down kernels
charpent@SAP5057241:~$ 

It seems clear that something is flawed in Sage's version of the Ipython 
notebook : its extensions search path seems flawed.

Any ideas ?

HTH,

--
Emmanuel Charpentier

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