Исках да докажа, че if there is m which is less than 10 and there is n which is less than 15 then there exist z which is less than 25.
thm : ((∃ λ m → (m < 10)) AND (∃ λ n → (n < 15))) -> (∃ λ z → (z < 25))
thm = ?
Как да дефинирам И тук?? Моля, помогни ми. И как да го докажа??