How to express the highest back voltage "√2U2" of an ideal diode by handwriting?

Expression: In the step-down rectifier circuit of AC transformer, the diode is connected to the secondary voltage of transformer. The primary voltage of the transformer is U 1, the secondary voltage is U2, and the diode is turned on in the positive half cycle of U2; In the negative half cycle, the diode turns off and bears the peak voltage of U2.

√2U2 .

Good sir: Lu Yuan's beautiful line.

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