Related Clues:

• Subsidiary proposition proved for use in proving another proposition
• Subsidiary theorem, in math
• Lexicographer's beginning with novel headword
• Liberal introducing novel proposition
• Theorem offshoot
• A headword in a dictionary
• Little theorem within a bigger theorem
• The outer of two bracts surrounding each floret in a grass spikelet
• Secondary proposition from man docked on lunar module
• In maths, a theorem proved to help to prove another one
• Step in a mathematical proof
• Intermediate theorem
• Proposition left a married French woman taken aback