1 | initial version |

That's a good question. You can inspect the global variables that have been defined at any given point in a session, but most of those will be defined when various modules load on Sage startup. You can look just at those globals whose type is `sage.symbolic.expression.Expression`

, there aren't too many at startup:

```
sage: for k in globals():
....: if type(G[k]) == sage.symbolic.expression.Expression:
....: print k
golden_ratio
log2
NaN
merten
I
twinprime
pi
catalan
brun
euler_gamma
x
khinchin
i
glaisher
mertens
```

Anything not on that list is a global symbolic expression that is defined in your loaded session. Variables will be among these.

2 | No.2 Revision |

That's a good question. You can inspect the global variables that have been defined at any given point in a session, but most of those will be defined when various modules load on Sage startup. You can look just at those globals whose type is `sage.symbolic.expression.Expression`

, there aren't too many at startup:

```
sage: G = globals()
sage: for k in
```~~globals():
~~G:
....: if type(G[k]) == sage.symbolic.expression.Expression:
....: print k
golden_ratio
log2
NaN
merten
I
twinprime
pi
catalan
brun
euler_gamma
x
khinchin
i
glaisher
mertens

Anything not on that list is a global symbolic expression that is defined in your loaded session. Variables will be among these.

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