2.1: Relations on sets
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Relations and functions (Khan Academy)
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2.2: Reflexivity, symmetry and transitivity
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Equivalence relations made easy (Randell Heyman)
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2.3: Functions on general sets
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Functions (TheTrevTutor):
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2.4: Examples of real functions
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How to Find the Domain(mathbff):
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2.5: Composition of functions
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Introduction to function composition (Khan Academy):
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Composition of Functions (fbt):
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2.6: One-to-one, onto and inverse functions
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Injective, Surjective, Bijective Functions (TheTrevTutor):
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Surjective (onto) functions made easy (Randell Heyman):
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Introduction to function inverses (Khan Academy):
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2.7: Real functions of several variables
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Multivariable functions (Khan Academy - Grant Sanderson):
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Introduction to 3d graphs (Khan Academy - Grant Sanderson):
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Contour plots (Khan Academy - Grant Sanderson):
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