If the condition/parameter is rapidity of 1 hyperbolic radian, what is the proper velocity w dx/dτ in units of c?
create table table_15314901_1 (proper_velocity_w_dx_dτ_in_units_of_c varchar, condition_parameter varchar, PRIMARY KEY (proper_velocity_w_dx_dτ_in_units_of_c))
select proper_velocity_w_dx_dτ_in_units_of_c from table_15314901_1 where condition_parameter = "rapidity of 1 hyperbolic radian"