MF1td1

fR R
f
f
f
f
f
f(x)=0
fR
f2 +∞
fR
f y = 2x−1

∀x∈R√x2=x
∀x∈R1
x2+ 1 <1
x x2+x+ 1 = 0
∀n∈Nn2−1
∃x∈Rcos(x) = x
A B
(A=⇒B)⇐⇒ (¬A∨B)
¬(A=⇒B)⇐⇒ (A∧ ¬B)
¬(A∧B)⇐⇒ (¬A∨ ¬B)
¬(A∨B)⇐⇒ (¬A∧ ¬B)
A B C
A∧(B∨C) (A∧B)∨(A∧C)
A∨(B∧C) (A∨B)∧(A∨C)
A B C
P:= (A∨B)⇒(C⇒(B∧C))
P

∀n∈Nn⇒n2
∀n∈Nn2⇒n
√2
I1
n∈N3n+ 1
n∈N∗
n
X
k=1
k=n(n+ 1)
2
n∈N
n
X
k=0
k!≤(n+ 1)!
n∈N∗2n+ 3n≤5n
n n(n+ 1)(n+ 2)