HI

problem with giac integration

this problem is present with W10 SageMath notebook 9.2

and also with W10 WSL Jupyter_lab SageMath notebook 9.2.

[edited 2021/5/1 :same problem with Ubuntu 18.04.5 LTS sagemath 9.1 Jupyter notebook]

you can run this sagemath code below many times but you can’t use restart the kernel and run again it seems there is a socket problem:

```
var('x,y,z,')
var('xLow,xUp')
var('yLow,yUp')
rNum=1
#xLow=sqrt(4*y^2/(sqrt(2) - 2) + sqrt(2)/(sqrt(2) - 2) - 2/(sqrt(2) - 2))
#xUp=y*sin(1/9*pi)/cos(1/9*pi)
#yLow=0.379024477
#yUp=0.921891033
zLow=0
zUp=sqrt(-x^2 - y^2 + 1)
zInt=integrate(1,z,zLow,zUp)
show(zInt)
yIntegr=integrate(zInt,y,yLow,yUp,algorithm="giac")
xIntegr=integrate(zInt,x,xLow,xUp,algorithm="giac")
show("yIntegr : " , yIntegr)
show("xIntegr : " , xIntegr)
```