Database
BASIC ALGEBRAIC STRUCTURES
Monoids
Monoid homomorphisms and submonoids
submrcl
Next ⟩
issubm
Metamath Proof Explorer
Ascii
Unicode
Theorem
submrcl
Description:
Reverse closure for submonoids.
(Contributed by
Mario Carneiro
, 7-Mar-2015)
Ref
Expression
Assertion
submrcl
⊢
S
∈
SubMnd
⁡
M
→
M
∈
Mnd
Proof
Step
Hyp
Ref
Expression
1
df-submnd
⊢
SubMnd
=
s
∈
Mnd
⟼
t
∈
𝒫
Base
s
|
0
s
∈
t
∧
∀
x
∈
t
∀
y
∈
t
x
+
s
y
∈
t
2
1
mptrcl
⊢
S
∈
SubMnd
⁡
M
→
M
∈
Mnd