Opened 2 years ago

## #26752 new defect

# Conversion from sympy to sage loses Lambert's W branch argument.

Reported by: | charpent | Owned by: | |
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Priority: | major | Milestone: | sage-8.5 |

Component: | symbolics | Keywords: | sympy, conversion |

Cc: | Merged in: | ||

Authors: | Reviewers: | ||

Report Upstream: | N/A | Work issues: | |

Branch: | Commit: | ||

Dependencies: | Stopgaps: |

### Description

See this ask.sagemath question.

sage: Ex 111/1000*t + e^(-3/10*t) - 1 sage: import sympy sage: sympy.solve(Ex) [10*LambertW(-100*exp(-100/37)/37)/3 + 1000/111, 10*LambertW(-100*exp(-100/37)/37, -1)/3 + 1000/111] sage: [s._sage_() for s in sympy.solve(Ex)] [10/3*lambert_w(-100/37*e^(-100/37)) + 1000/111, 10/3*lambert_w(-100/37*e^(-100/37)) + 1000/111]

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