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It is urgent to find the principal disjunctive normal form and principal conjunctive normal form of formula (┐P∨Q)∧(P→R) in discrete mathematics.
The steps are as follows:

(? P∨Q)∧(P→R)

(? P∨Q)∧(? P∨R) becomes conjunctive disjunction.

(? P∨Q∨(? R∧R))∧(? P∨(? Q∧Q)∞R) supplement

((? P∨Q∨? R)∧(? P∨Q∨R))∧(? P∨(? Q∧Q)∨R) distribution law 2

(? P∨Q∨? R)∧(? P∨Q∨R)∧(? P∨(? Q∧Q)∨R) associative law

(? P∨Q∨? R)∧(? P∨Q∨R)∧((? P∨? Q∨R)∧(? P∨Q∨R)) distribution law 2

(? P∨Q∨? R)∧(? P∨Q∨R)∧(? P∨? Q∨R)∧(? P∨Q∨R) associative law

(? P∨Q∨? R)∧(? P∨? Q∨R)∧(? P∨Q∨R) idempotent law

Get Lord conjunctive normal form.

Check the missing largest item again.

m? ∧M? ∧M∏(4,5,6)

∏(0, 1,2,3,7)? ∑(0, 1,2,3,7)? m? ∨m? ∨m? ∨m? ∨m?

(P∨Q∨R)∨? (P∨Q∨? R)∨? (P∨? Q∨R)∨? (P∨? Q∨? R)∨? (? P∨? Q∨? De Morgan's law

(? P∧? Q∧? r)∩(? P∧? Q∧R)∨(? P∧Q∧? r)∩(? P∧Q∧R)∨(P∧Q∧R) De Morgan's Law

Get the principal disjunctive normal form