
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
Given are three propositions: "① 0 < a = $\frac{1}{2}$ < 1. ② The function $f(x) = a^x$ is a decreasing function. ③ When 0 < a < 1, the function $f(x) = a^x$ is a decreasing function." When they form a syllogism, the "minor premise" is __________ (fill in the serial number).

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