On the Shape of Mathematical Arguments

A termination argument.- A problem on bichrome 6-graphs.- Proving the existence of the Euler line.- In adherence to symmetry.- On a proof by Arbib, Kfoury, and Moll.- Not about open and closed sets.- A monotonicity argument.- On the inverse of a function.- A calculational proof of Helly's theorem on convex figures.- The formal derivation of a proof of the invariance theorem.- Proving theorems with Euclid's algorithm.- On the deisng of an in-situ permutation algorithm.- Shiloach's algorithm.- Clarity of exposition.- On naming.- On the ue of formalism.- Epilogue.- Proof rules for guarded-command programs.- Notational conventions.