This diagram shows a pair of ovals, which contain smaller ovals inside of them. The first oval, labeled lowercase x subscript zero, contains a smaller oval labeled capital V with a line through it, subscript zero. Right underneath the bigger oval it expresses that t equals zero. An arrow points from the first big oval to the second. This arrow is labeled phi superscript i. The second big oval is labeled x. It contains a smaller oval,, which is labeled capital V with a line through it, as a function of t. Below the second big oval, there is a t.
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