mathematics_in_lean

My solutions for this book

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import MIL.C01_Introduction.S01_Getting_Started
import MIL.C01_Introduction.S02_Overview
import MIL.C02_Basics.S01_Calculating
import MIL.C02_Basics.S02_Proving_Identities_in_Algebraic_Structures
import MIL.C02_Basics.S03_Using_Theorems_and_Lemmas
import MIL.C02_Basics.S04_More_on_Order_and_Divisibility
import MIL.C02_Basics.S05_Proving_Facts_about_Algebraic_Structures
import MIL.C03_Logic.S01_Implication_and_the_Universal_Quantifier
import MIL.C03_Logic.S02_The_Existential_Quantifier
import MIL.C03_Logic.S03_Negation
import MIL.C03_Logic.S04_Conjunction_and_Iff
import MIL.C03_Logic.S05_Disjunction
import MIL.C03_Logic.S06_Sequences_and_Convergence
import MIL.C04_Sets_and_Functions.S01_Sets
import MIL.C04_Sets_and_Functions.S02_Functions
import MIL.C04_Sets_and_Functions.S03_The_Schroeder_Bernstein_Theorem
import MIL.C05_Elementary_Number_Theory.S01_Irrational_Roots
import MIL.C05_Elementary_Number_Theory.S02_Induction_and_Recursion
import MIL.C05_Elementary_Number_Theory.S03_Infinitely_Many_Primes
import MIL.C05_Elementary_Number_Theory.S04_More_Induction
import MIL.C06_Discrete_Mathematics.S01_Finsets_and_Fintypes
import MIL.C06_Discrete_Mathematics.S02_Counting_Arguments
import MIL.C06_Discrete_Mathematics.S03_Inductive_Structures
import MIL.C07_Structures.S01_Structures
import MIL.C07_Structures.S02_Algebraic_Structures
import MIL.C07_Structures.S03_Building_the_Gaussian_Integers
import MIL.C08_Hierarchies.S01_Basics
import MIL.C08_Hierarchies.S02_Morphisms
import MIL.C08_Hierarchies.S03_Subobjects
import MIL.C09_Groups_and_Rings.S01_Groups
import MIL.C09_Groups_and_Rings.S02_Rings
import MIL.C10_Linear_Algebra.S01_Vector_Spaces
import MIL.C10_Linear_Algebra.S02_Subspaces
import MIL.C10_Linear_Algebra.S03_Endomorphisms
import MIL.C10_Linear_Algebra.S04_Bases
import MIL.C11_Topology.S01_Filters
import MIL.C11_Topology.S02_Metric_Spaces
import MIL.C11_Topology.S03_Topological_Spaces
import MIL.C12_Differential_Calculus.S01_Elementary_Differential_Calculus
import MIL.C12_Differential_Calculus.S02_Differential_Calculus_in_Normed_Spaces
import MIL.C13_Integration_and_Measure_Theory.S01_Elementary_Integration
import MIL.C13_Integration_and_Measure_Theory.S02_Measure_Theory
import MIL.C13_Integration_and_Measure_Theory.S03_Integration
import MIL.Common