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import Mathlib.Algebra.BigOperators.Basic
import Mathlib
import TestGame.Metadata
set_option tactic.hygienic false
Game "TestGame"
World "Induction"
Level 1
Title "Simp"
Introduction
"
Statement
""
(n : ℕ) : True := by
trivial
Tactics simp
-- Σ_i Σ_j ... = Σ_j Σ_i ...
-- rw [sum_comm]
example : ¬ ∀ (x : ℕ), x ≥ 10 := by
push_neg
use 5
simp
¬ ∀ (...) ↔ ∃ (¬ ...)