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What mappings are functions?
Many to one AND one to one
What makes a mapping NOT a function?
If the input is joined to ‘many’ in the output (ie. one to many or many to many)
What does ℕ stand for?
Natural numbers (eg positive intergers: 1,2,3,4…)
What does ℤ stand for?
Intergers (whole numbers: 0, +-1, +-2…)
What does ℚ stand for?
Quotients (fractional numbers: 1/2, 1/4, 1/6 etc.)
What does ℝ stand for?
Real numbers (eg. : 0, pi, e, -1/2…)