## Notre Dame Journal of Formal Logic

- Notre Dame J. Formal Logic
- Volume 61, Number 2 (2020), 203-225.

### Effective Domination and the Bounded Jump

#### Abstract

We study the relationship between effective domination properties and the bounded jump. We answer two open questions about the bounded jump: (1) We prove that the analogue of Sacks jump inversion fails for the bounded jump and the $\mathrm{wtt}$-reducibility. (2) We prove that no c.e. bounded high set can be low by showing that they all have to be Turing complete. We characterize the class of c.e. bounded high sets as being those sets computing the Halting problem via a reduction with use bounded by an $\omega $-c.e. function. We define several notions of a c.e. set being effectively dominant, and show that together with the bounded high sets they form a proper hierarchy.

#### Article information

**Source**

Notre Dame J. Formal Logic, Volume 61, Number 2 (2020), 203-225.

**Dates**

Received: 13 February 2018

Accepted: 25 April 2019

First available in Project Euclid: 7 April 2020

**Permanent link to this document**

https://projecteuclid.org/euclid.ndjfl/1586224879

**Digital Object Identifier**

doi:10.1215/00294527-2020-0005

**Mathematical Reviews number (MathSciNet)**

MR4092531

**Zentralblatt MATH identifier**

07222687

**Subjects**

Primary: 03D30: Other degrees and reducibilities

Secondary: 03D28: Other Turing degree structures

**Keywords**

wtt-degrees dominant function bounded jump jump inversion high degrees

#### Citation

Ng, Keng Meng; Yu, Hongyuan. Effective Domination and the Bounded Jump. Notre Dame J. Formal Logic 61 (2020), no. 2, 203--225. doi:10.1215/00294527-2020-0005. https://projecteuclid.org/euclid.ndjfl/1586224879