Exam-style question
Try this first
Which of the following is a valid 4-vector over the real numbers?.
- A.[2.0, 3.14159, -1.0, 2.718281828]
- B.[2.0, 3.0, "-1.0", 4.0]
- C.[2, 3, True, 4]
- D.[2.0, 3.0, -1.0]
Model answer
What a good answer should say
- [2.0, 3.14159, -1.0, 2.718281828]
Explanation
Why this works
A 4-vector has four entries, and all entries must be drawn from the same field. The first option contains four real-number entries.
Common mistake
No common mistake is linked to this question yet.