I am performing some symbolic calculations and found that Sage does not 
automatically linearly combine symbolic assumptions.

Minimal example:

sage: forget()
....: a,b,c= var('a,b,c')
....: assume(a>0, b+c >0)
....: print bool(a+b+c > 0)
....: print assumptions()
....: 
False
[a > 0, b + c > 0]

The same was tested running Maxima in Sage and the same thing happened.
Is this the expected behavior? 


I am running Sage version 8.8 on mac. os 10.14. 

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