Crossword puzzle clue "worked hard on a mathematical proof"

Here are the possible solutions for worked hard on a mathematical proof clue

Answer
Clue
Relevancy
earnedyourqed
Clue
Worked hard on a mathematical proof?
axiom
Clue
Start of a mathematical proof
Definition
a self-evident truth
qed
Clue
Mathematical proof letters
queensizeqed
Clue
Royal ending to a mathematical proof?
toiled
Clue
Worked and worked
calluses
Clue
Visible proof of hard work
Definition
CALLUS, to form a hard growth
bustedoneschops
Clue
Worked really hard
Really worked hard

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