Below is an context that describes a sql query, paired with an question that provides further information. Write an answer that appropriately completes the request.  # noqa: E501
### Context:
CREATE TABLE table_15314901_1 (proper_velocity_w_dx_dτ_in_units_of_c VARCHAR, condition_parameter VARCHAR)
### Question:
If the condition/parameter is rapidity of 1 hyperbolic radian, what is the proper velocity w dx/dτ in units of c?
### Answer:
SELECT proper_velocity_w_dx_dτ_in_units_of_c FROM table_15314901_1 WHERE condition_parameter = "Rapidity of 1 hyperbolic radian"