Go backward to Decomposition of Equivalences Go up to Top Go forward to Example

Typical Use

We prove G₀ <=> G₁:

• => : ...(proof of G₀ => G₁).
• <= : ...(proof of G₁ => G₀).

We prove G₀ <=> G₁ <=> G₂, i.e., (G₀ <=> G₁) /\  (G₁ <=> G₂):

• G₀ => G₁,
• G₁ => G₂,
• G₂ => G₀.

Traverse the "implication circle"!