
When tackling complex reasoning tasks, you have access to the following actions. Use them as needed to progress through your thought process.

[ASSESS]

[ADVANCE]

[VERIFY]

[SIMPLIFY]

[SYNTHESIZE]

[PIVOT]

[OUTPUT]

You should strictly follow the format below:

[ACTION NAME]

# Your action step 1

# Your action step 2

# Your action step 3

...

Next action: [NEXT ACTION NAME]


system
Among the following statements, the incorrect one(s) is/are ______ (only fill in the number):  
① If set A=φ, then φ⊆A;  
② If set A={x|x²-1=0}, B={-1,1}, then A=B;  
③ In the mapping from set A to B, for any element y in set B, there is a unique corresponding element x in set A;  
④ The decreasing interval of the function f(x) = $$\frac{1}{x}$$ is (-∞, 0)∪(0, +∞);  
⑤ If set A={x|1＜x＜2} and B={x|x＜a}, and A⊆B, then a＞2.

Present the answer in LaTex format: \boxed{Your answer}
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