user: ### NOW ANSWER:
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?
Columns: ['Condition/Parameter', 'Coordinate velocity v dx/dt in units of c', 'Velocity angle η in i-radians', 'Proper velocity w dx/dτ in units of c', 'Lorentz factor γ dt/dτ = E/mc 2']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Momentum = ½mc ⇔ 0.5 map-lightyear/traveler-year', '1/√5 ≅ 0.447', 'ln[(1 + √5)/2] ≅ 0.481', '½', '√5/2 ≅ 1.118']
SQL:

assistant: SELECT "Proper velocity w dx/dτ in units of c" FROM "Table" WHERE "Lorentz factor γ dt/dτ = E/mc 2" = '√5 ≅ 2.236';