Scheme: eqv? vs equal?

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You can read a few lengthy explanations on Stack Overflow, but in a nutshell:

• equal? returns true if its arguments have the same structure. This is comparable to == in most languages.
• eqv? is a pointer comparison. It looks at memory addresses.
  • The exception is numbers.
  • Unlike eq?, it will compare numeric data instead of addresses.
  • However, it won't convert between int and float data.

Further Reading

• Stack Overflow question
• Washington University page