The R-sequence is another type of low-discrepancy sequence based on specially chosen irrational numbers[10]. It is similar to interleaved gradient noise but is simpler to compute and possibly more effective as a dither, particularly when augmented with a triangle wave function as demonstrated:
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第三十七条 纳税人发生应税交易，应当向购买方开具发票。有下列情形之一的，不得开具增值税专用发票：