
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
A number is called triangular if it is equal to the sum of several consecutive natural numbers, starting from 1. Can the number 2015 be represented as the difference of two four-digit triangular numbers?

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