Assertion: tree's parent | /r/AtLocation | index
Facets:
Source sentences:
text: while its parent (if any) is found at index ⌊ i − 1 m ⌋ {
text: while its parent (if any) is found at index ⌊ i − 1 2 ⌋ {\displaystyle \left\lfloor {\frac {i-1}{2}}\right\rfloor } (assuming the root has index zero).