This varies by jurisdiction, obviously. In the US, "gifts" from one individual to another are non-taxable up to $13,000 per person per year, for the IRS's definition of "gift." The donor pays a gift t…
1. The adjacency matrix of a graph constructed from an adjacency matrix should either be the same or one should get an error when constructing the graph:
```
sage: a = matrix(2,2,[1,0,0,1])
sage: G…