How is this calculated?

A team is counted as still in it when at least one set of results for the matches left would put it there, taking into account that its rivals also play each other. It is counted as sure only when no set of results can take it away. Teams level on points are treated cautiously while matches remain: level is enough to stay in, never enough to be sure, because goal difference and the other tie-breaks are only applied once the season is over. Points deductions are included as published in the league table.

Inter led Serie A after matchday 20 of 2023-24.

With 51 points, they were 2 ahead of Juventus. Nothing was decided mathematically on this matchday.

Results

Date	Home	Score	Away
13 Jan	Genoa	0–0	Torino
13 Jan	Napoli	2–1	Salernitana
13 Jan	Verona	2–1	Empoli
13 Jan	Monza	1–5	Inter
14 Jan	Lazio	1–0	Lecce
14 Jan	Cagliari	2–1	Bologna
14 Jan	Fiorentina	2–2	Udinese
14 Jan	AC Milan	3–1	Roma
15 Jan	Atalanta	5–0	Frosinone
16 Jan	Juventus	3–0	Sassuolo

Table after matchday 20

Pos.	Team	Played	Goal diff.	Points	Max.	Title
1	Inter	20	+39	51	105	In it
2	Juventus	20	+20	49	103	In it
3	AC Milan	20	+17	42	96	In it
4	Fiorentina	20	+8	34	88	In it
5	Atalanta	20	+14	33	87	In it
6	Lazio	20	+4	33	87	In it
7	Bologna	20	+5	32	86	In it
8	Napoli	20	+5	31	85	In it
9	Roma	20	+8	29	83	In it
10	Torino	20	+0	28	82	In it
11	Monza	20	-5	25	79	In it
12	Genoa	20	-4	22	76	In it
13	Lecce	20	-6	21	75	In it
14	Sassuolo	20	-10	19	73	In it
15	Frosinone	20	-14	19	73	In it
16	Udinese	20	-11	18	72	In it
17	Cagliari	20	-14	18	72	In it
18	Verona	20	-9	17	71	In it
19	Empoli	20	-24	13	67	In it
20	Salernitana	20	-23	12	66	In it

Max.: the most points the team can still finish on.

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Quick answers

Who was top of Serie A after matchday 20 of 2023-24?: Inter led Serie A after matchday 20 of 2023-24. With 51 points, they were 2 ahead of Juventus.
What was decided on matchday 20 of the 2023-24 Serie A?: Nothing was decided mathematically on this matchday.
How is this calculated?: A team is counted as still in it when at least one set of results for the matches left would put it there, taking into account that its rivals also play each other. It is counted as sure only when no set of results can take it away. Teams level on points are treated cautiously while matches remain: level is enough to stay in, never enough to be sure, because goal difference and the other tie-breaks are only applied once the season is over. Points deductions are included as published in the league table.