madvorak / lean3-tactic-lean4

Reference sheet for people who know Lean 3 and want to write tactic-based proofs in Lean 4

Lean 3	Lean 4	requires
all_goals	all_goals	[core]
any_goals	any_goals	[core]
apply	apply	[core]
assumption	assumption	[core]
by_cases	by_cases	import Mathlib.Tactic.Basic
by_contradiction	by_contra	import Std.Tactic.Basic
by_contra	by_contra	import Std.Tactic.Basic
by_contra'	by_contra'	import Mathlib.Tactic.ByContra
cases	cases'	import Mathlib.Tactic.Cases
congr	congr	[core]
contradiction	contradiction	[core]
contrapose	contrapose	import Mathlib.Tactic.Contrapose
convert	convert	import Mathlib.Tactic.Convert
convert_to	convert_to	import Mathlib.Tactic.Convert
exact	exact	[core]
exfalso	exfalso	import Std.Tactic.Basic
field_simp	field_simp	import Mathlib.Tactic.FieldSimp
finish	—	—
have	have	import Mathlib.Tactic.Have
hint	hint	import Mathlib.Tactic.Hint
induction	induction'	import Mathlib.Tactic.Cases
intro	intro	[core]
intros	intro	[core]
iterate	iterate	import Std.Tactic.Basic
left	left	import Std.Tactic.LeftRight
library_search	exact?	[core]
linarith	linarith	import Mathlib.Tactic.Linarith
omega	—	—
push_neg	push_neg	import Mathlib.Tactic.PushNeg
rcases	rcases	import Std.Tactic.RCases
refl	rfl	[core]
repeat	repeat'	import Std.Tactic.Basic
right	right	import Std.Tactic.LeftRight
ring	ring	import Mathlib.Tactic.Ring
rintro	rintro	import Std.Tactic.RCases
rw	rw	[core]
simp	simp	[core]
sorry	sorry	[core]
specialize	specialize	[core]
split	constructor	[core]
split_ifs	split	[core]
squeeze_simp	simp?	import Std.Tactic.SimpTrace
suggest	apply?	[core]
swap	swap	import Mathlib.Tactic.PermuteGoals
symmetry	symm	import Mathlib.Tactic.Relation.Symm
tauto	tauto	import Mathlib.Tactic.Tauto
try	try	[core]
unfold	unfold	[core]
use	use	import Mathlib.Tactic.Use