feat(Analysis/SpecialFunctions/Complex/Log): natural number versions of exp_eq_one_iff

[riccardobrasca]

Add two lemmas:

• Complex.exp_eq_one_iff_of_im_nonneg, a variant of Complex.exp_eq_one_iff that gives a natural number instead of an integer, under the hypothesis that the imaginary part is nonneg.
• Complex.exp_two_pi_mul_I_mul_div_eq_one_iff, showing that exp (2πik/N) = 1 if and only if N ∣ k.

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[github-actions]

PR summary bdd1fc861b

Import changes for modified files

No significant changes to the import graph

Import changes for all files

Files	Import difference

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Declarations diff

+ exp_eq_one_iff_of_im_nonneg
+ exp_two_pi_mul_I_mul_div_eq_one_iff

You can run this locally as follows

## summary with just the declaration names:
./scripts/pr_summary/declarations_diff.sh <optional_commit>

## more verbose report:
./scripts/pr_summary/declarations_diff.sh long <optional_commit>

The doc-module for scripts/pr_summary/declarations_diff.sh contains some details about this script.

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No changes to technical debt.

You can run this locally as

./scripts/reporting/technical-debt-metrics.sh pr_summary

• The relative value is the weighted sum of the differences with weight given by the inverse of the current value of the statistic.
• The absolute value is the relative value divided by the total sum of the inverses of the current values (i.e. the weighted average of the differences).