CREATE TABLE "table1_15314901_1" (
  "condition_parameter" text,
  "coordinate_velocity_v_dx_dt_in_units_of_c" text,
  "velocity_angle_in_i_radians" text,
  "proper_velocity_w_dx_d_in_units_of_c" text,
  "lorentz_factor_dt_d_e_mc_2" text
);

Question: If the velocity angle is ln[(1 + √5)/2] ≅ 0.481, what is the condition/parameter?
SQL: SELECT "condition_parameter" FROM "table1_15314901_1" WHERE "velocity_angle_in_i_radians"='ln[(1 + √5)/2] ≅ 0.481';

Question: If the the condition/parameter is rapidity of 2 hyperbolic radians, what is the coordinate velocity v dx/dt in units of c?
SQL: SELECT "coordinate_velocity_v_dx_dt_in_units_of_c" FROM "table1_15314901_1" WHERE "condition_parameter"='Rapidity of 2 hyperbolic radians';

Question: If the coordinate velocity v dx/dt in units of c is (e 2 − 1)/(e 2 + 1) ≅ 0.761, what is the velocity angle η in i-radians?
SQL: SELECT "velocity_angle_in_i_radians" FROM "table1_15314901_1" WHERE "coordinate_velocity_v_dx_dt_in_units_of_c"='(e 2 − 1)/(e 2 + 1) ≅ 0.761';

Question: What is the coordinate velocity v dx/dt in units of c total number if the velocity angle η in i-radians is ln[2 + √5] ≅ 1.444?
SQL: SELECT COUNT("coordinate_velocity_v_dx_dt_in_units_of_c") FROM "table1_15314901_1" WHERE "velocity_angle_in_i_radians"='ln[2 + √5] ≅ 1.444';

Question: If the condition/parameter is rapidity of 1 hyperbolic radian, what is the proper velocity w dx/dτ in units of c?
SQL: SELECT "proper_velocity_w_dx_d_in_units_of_c" FROM "table1_15314901_1" WHERE "condition_parameter"='Rapidity of 1 hyperbolic radian';

Question: If the lorentz factor γ dt/dτ = e/mc 2 is √5 ≅ 2.236, what is the proper velocity w dx/dτ in units of c?
SQL: SELECT "proper_velocity_w_dx_d_in_units_of_c" FROM "table1_15314901_1" WHERE "lorentz_factor_dt_d_e_mc_2"='√5 ≅ 2.236';