π§ πβ΄
π«π‘β‘οΈπ₯β
PβQ
π °οΈβπ ±οΈβ΄β
π+πββ
ππ€β‘οΈ
1οΈβ£π2οΈβ£ββ¨2οΈβ£
π‘β‘οΈπ΅βπ«β‘οΈβπ‘
π£οΈππ’
πβπ
#logical proof #argument structure #therefore #formal proof