A thing is equal to itself

Principle, equality

Builds on

• A level scale means both sides weigh the same

Leads to

• Adding nothing leaves a thing as it was
• If one thing equals another, the second equals the first
• One of a thing is just that thing
• Two things equal to the same thing are equal to each other

Lessons

• Lesson 1: A = A · Make it balance.
• Lesson 1: A = A · Write down what you see
• Lesson 1: A = A · The first identity

All ideas